CN204101295U - The test unit of single cylinder engine simulation complete machine - Google Patents
The test unit of single cylinder engine simulation complete machine Download PDFInfo
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- CN204101295U CN204101295U CN201420553287.6U CN201420553287U CN204101295U CN 204101295 U CN204101295 U CN 204101295U CN 201420553287 U CN201420553287 U CN 201420553287U CN 204101295 U CN204101295 U CN 204101295U
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Abstract
The utility model provides the test unit of a kind of single cylinder engine simulation complete machine, and it includes: a single cylinder engine body, an air inlet pipeline, an inlet box, a gas outlet and a simulation pressure charging system; The air intake opening of described single cylinder engine body is communicated with described gas outlet with described inlet box respectively with exhausr port; Described air inlet pipeline is communicated with described inlet box; Described air inlet pipeline and described gas outlet are all communicated with described simulation pressure charging system, and described simulation pressure charging system is for simulating the intake and exhaust border of complete machine cylinder; The volume of described inlet box is not less than the average volume of the inlet box of complete machine to be simulated.By arranging simulation pressure charging system and to be connected with single cylinder engine body and arranging sensor further in position to measure and the mode of data processing is effectively simulated complete machine.
Description
Technical field
The utility model relates to the test unit of a kind of single cylinder engine simulation complete machine.
Background technology
At present, adopt single cylinder engine test prediction of Diesel Engine overall performance index can significantly reduce overall test workload, for reduction Diesel Engine Development cost, shorten the Diesel Engine Development cycle significant.Large-scale diesel engine output is little, and the production cycle is long, and diesel engine manufacturing cost is high, and testing expenses are high, Chang Zuowei main experimental model machine.
Single cylinder engine test accurate simulation overall performance index key is that the work done of in-cylinder combustion stage is consistent with complete machine with the intake and exhaust border of combustion phases.The work done of in-cylinder combustion stage refers to the work done of gas in the jar at compression and expansion stroke.This stage work done and combustion process and complete machine power index directly related, do work in the cylinder relative to whole circulation, with the work done of in-cylinder combustion stage for simulated target can get rid of single cylinder engine and complete machine pumping loss difference to the impact of simulation precision.Single cylinder engine, owing to only having a cylinder, can not directly adopt complete machine boosting system arrangement, also cannot consider pressure wave transmission impact between each cylinder of complete machine, need the intake and exhaust boundary parameter for complete machine cylinder to simulate.Diesel engine combustion intake and exhaust boundary parameter comprises excess air coefficient, coefficient of scavenging, coefficient of residual gas, intake air temperature, intake swirl etc., and for single cylinder engine simulation complete machine, topmost is excess air coefficient, coefficient of scavenging, intake air temperature.Excess air coefficient for the charging stage terminate after stay tolerance in cylinder and burning and to burn completely the ratio of the tolerance consumed, coefficient of scavenging total tolerance that to be the charging stage sucked by gas admittance valve and the ratio staying tolerance in cylinder.
Existing single cylinder engine simulation complete machine method does not strictly simulate the standard on complete machine border using air inflow as single cylinder engine, the parameters such as single cylinder engine admission pressure, temperature, exhaust back pressure are determined according to single cylinder engine is consistent with complete machine air inflow, and using the admission pressure of complete machine and exhaust back pressure directly as the border of single cylinder engine test, the method is the difference taking into full account single cylinder engine and complete machine intake and exhaust flowing, often makes single cylinder engine and overall performance parameter have notable difference.
Utility model content
The technical problems to be solved in the utility model is to overcome the larger defect of prior art cost single cylinder engine simulation complete machine time error, providing the test unit of the single cylinder engine simulation complete machine that a kind of error is less, precision is higher.
The utility model solves above-mentioned technical matters by following technical proposals:
The utility model provides a kind of single cylinder engine to simulate the test unit of complete machine, its feature is, it is for realizing the test method of single cylinder engine as above simulation complete machine, and the test unit of described single cylinder engine simulation complete machine includes: a single cylinder engine body, an air inlet pipeline, an inlet box, a gas outlet and a simulation pressure charging system;
The air intake opening of described single cylinder engine body is communicated with described gas outlet with described inlet box respectively with exhausr port;
Described air inlet pipeline is communicated with described inlet box;
Described air inlet pipeline and described gas outlet are all communicated with described simulation pressure charging system, and described simulation pressure charging system is for simulating the intake and exhaust border of complete machine cylinder;
The volume of described inlet box is not less than the average volume of the inlet box of complete machine to be simulated.
, because the cylinder exhaust border of single cylinder engine and complete machine there are differences, therefore to simulate the exhaust border of complete machine herein, need by simulation pressure charging system.
Preferably, the air inlet pressure sensor for measuring admission pressure and the heat sensitive sensor for measuring intake air temperature is provided with in described inlet box.
Preferably, described gas outlet includes an exhaust main and an exhaust branch pipe, and described exhaust main is communicated with described simulation pressure charging system, and described exhaust branch pipe one end is communicated with described exhaust main, and the other end is communicated with described exhausr port;
The inner side of one end that described exhaust branch pipe is communicated with described exhausr port is provided with one for measuring the back pressure transducer of discharge pressure.
Preferably, the test unit of described single cylinder engine simulation complete machine also includes a cylinder head, on the air intake opening that described cylinder head is covered on described single cylinder engine body and exhausr port.
Herein, cylinder head is used for carrying out protection to the parts of single cylinder engine body and can the parts such as support and connection gas outlet and inlet box.
Positive progressive effect of the present utility model is: by arranging simulation pressure charging system and to be connected with single cylinder engine body and arranging sensor further in position to measure and the mode of data processing is effectively simulated complete machine.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the test method of the single cylinder engine simulation complete machine of the utility model preferred embodiment.
Fig. 2 is the structural representation of the test unit of the utility model preferred embodiment single cylinder engine simulation complete machine.
Embodiment
Lift preferred embodiment below, and come by reference to the accompanying drawings clearlyer intactly the utility model to be described.
Mode below by embodiment further illustrates the utility model, but is not therefore limited among described scope of embodiments by the utility model.
Fig. 1 is the process flow diagram of the test method of the single cylinder engine simulation complete machine of the present embodiment, and as shown in Figure 1, the test method of the single cylinder engine simulation complete machine that the present embodiment relates to includes following steps:
Step 1, set up a complete machine realistic model and a single cylinder engine realistic model.
Step 2, operation complete machine realistic model draw complete machine high pressure indicated pressure and boundary parameter, wherein, complete machine high pressure indicated pressure is the gas in the jar mean indicated pressure (MIP) of complete machine realistic model at compression and expansion node, and boundary parameter includes that single cylinder air inlet terminates air inflow in cylinder, air inlet terminates intake air temperature and total air inflow.
In multi-cylinder complete machine, work as upstroke, after gas admittance valve cuts out, air in cylinder is compressed, constantly tiny along with volume, the pressure and temperature of air also just constantly raises, and the pressure of compression terminal is relevant with the compression degree of air with humidity, namely relevant with ratio of compression, the pressure and temperature of Normal squeezing terminal is respectively 4 ~ 8MPa and 750 ~ 950K.In the present embodiment, air inflow, the parameters such as temperature and humidity all can one coexist in complete machine realistic model and set.
Step 3, operation single cylinder engine realistic model, the high pressure indicated pressure of adjustment single cylinder engine realistic model is until equal with complete machine high pressure indicated pressure, the admission pressure of adjustment single cylinder engine realistic model, intake air temperature, exhaust back pressure until the boundary parameter of single cylinder engine realistic model consistent with the boundary parameter of complete machine realistic model after, record admission pressure, intake air temperature, the exhaust back pressure of single cylinder engine realistic model now.
Step 4, run entity single cylinder engine to be measured, the moment of torsion of adjustment entity single cylinder engine makes the high pressure indicated pressure of entity single cylinder engine equal with complete machine high pressure indicated pressure, inlet pressure adjusting valve, intake air temperature well heater, the exhaust backpressure valve of adjustment entity single cylinder engine, make the admission pressure of the admission pressure of entity single cylinder engine, intake air temperature, exhaust back pressure and the single cylinder engine realistic model recorded in step 3, intake air temperature, exhaust back pressure equal.
Step 5, substituting into complete machine realistic model by measuring the burning and heat release rate curve drawing entity single cylinder engine, drawing one group of high pressure indicated pressure and boundary parameter.
The starting point calculating combustion heat release rate can adopt the first law of thermodynamics.When calculating rate of heat release, adopting zero combustion model, thinking in cylinder to be equally distributed combination gas.A fuel combustion liberated heat part for improve gas in the jar interior can and be used for externally acting, a part is passed to chamber wall and is formed radiation loss.In combustion process, arbitrary instantaneous heat balance equation is:
Q
f＝Q+Q
W＝ΔU+W+Q
W；
Wherein Q
ffor this instantaneous front fuel combustion liberated heat; Q is the heat that this instantaneous front gas in the jar absorbs; Q
wfor this instantaneous forward pass is to the heat of casing wall; Δ U is gas internal energy variable quantity; W for from calculating originating point to this instant gas institute work.
Step 6, judge whether the deviation ratio of one group of high pressure indicated pressure and boundary parameter and complete machine high pressure indicated pressure and boundary parameter is greater than a setting ratio, perform step 2 if then return, then perform step 7 if not.
Step 7, using maximum combustion pressure that entity single cylinder engine the is surveyed maximum combustion pressure as complete machine to be simulated.
Step 8, calculated complete machine fuel consumption, the complete machine NOx emission value of complete machine to be simulated by single cylinder engine observed economy that entity single cylinder engine is surveyed, single cylinder engine actual measurement NOx emission value single cylinder engine measured power and complete machine power per cylinder, computing method are as follows:
Complete machine fuel consumption=single cylinder engine observed economy × single cylinder engine measured power ÷ complete machine power per cylinder;
Complete machine NOx emission value=single cylinder engine actual measurement NOx emission value × single cylinder engine measured power ÷ complete machine power per cylinder.
Step 9, using single cylinder engine smoke intensity measured value that entity single cylinder engine the is surveyed complete machine smoke intensity value as complete machine to be simulated.
Step 10, the burning and heat release rate curve of the entity single cylinder engine in step 5 is substituted into complete machine realistic model, calculate the complete machine row temperature value of complete machine to be simulated.
Because the complete machine of entity is not yet developed, complete machine boundary parameter can not be measured by actual measurement, can only calculate, may there is deviation by simulating.So, need in test by deriving complete machine boundary parameter based on the data of single cylinder engine actual measurement, these data that can survey just include above-mentioned combustion heat release rate, admission pressure, intake air temperature and exhaust back pressure, therefore, combustion heat release rate by the airborne measurements of entity single cylinder is obtained in step 5, step 6 substitutes into whole machine model further, boundary parameter when calibration complete machine runs.By contrast two groups of complete machine boundary parameters repeatedly, finally can obtain the comparatively reasonably boundary parameter of complete machine to be simulated, and then derive other tractor parameter by comparatively rational boundary parameter.
The present embodiment also relates to the test unit of a kind of single cylinder engine simulation complete machine, and Fig. 2 is the structural representation of the test unit of the present embodiment single cylinder engine simulation complete machine, and as shown in Figure 2, the test unit of the single cylinder engine simulation complete machine that the present embodiment relates to includes:
Single cylinder engine body 700, air inlet pipeline 100, inlet box 200, exhaust main 500, exhaust branch pipe 400 and simulation pressure charging system 600.The air intake opening of single cylinder engine body 700 is communicated with gas outlet with inlet box 200 respectively with exhausr port.Air inlet pipeline 100 is communicated with inlet box 200.
Air inlet pipeline 100 and exhaust main 500 are all communicated with simulation pressure charging system 600, and simulation pressure charging system 600 is for simulating the intake and exhaust border of complete machine cylinder.
The volume of inlet box 200 is not less than the average volume of the inlet box of complete machine to be simulated.
The air inlet pressure sensor for measuring admission pressure and the heat sensitive sensor for measuring intake air temperature is provided with in inlet box 200.
Exhaust branch pipe 400 one end is communicated with exhaust main 500, and the other end is communicated with exhausr port.The inner side of one end that exhaust branch pipe 400 is communicated with exhausr port is provided with one for measuring the back pressure transducer of discharge pressure.
On the air intake opening that cylinder head 300 is covered on single cylinder engine body 700 and exhausr port.
Although the foregoing describe embodiment of the present utility model, it will be understood by those of skill in the art that this only illustrates, protection domain of the present utility model is defined by the appended claims.Those skilled in the art, under the prerequisite not deviating from principle of the present utility model and essence, can make various changes or modifications to these embodiments, but these change and amendment all falls into protection domain of the present utility model.
Claims (4)
1. a test unit for single cylinder engine simulation complete machine, it is characterized in that, it includes: a single cylinder engine body, an air inlet pipeline, an inlet box, a gas outlet and a simulation pressure charging system;
The air intake opening of described single cylinder engine body is communicated with described gas outlet with described inlet box respectively with exhausr port;
Described air inlet pipeline is communicated with described inlet box;
Described air inlet pipeline and described gas outlet are all communicated with described simulation pressure charging system, and described simulation pressure charging system is for simulating the intake and exhaust border of complete machine cylinder;
The volume of described inlet box is not less than the average volume of the inlet box of complete machine to be simulated.
2. the test unit of single cylinder engine simulation complete machine as claimed in claim 1, is characterized in that, being provided with the air inlet pressure sensor for measuring admission pressure and the heat sensitive sensor for measuring intake air temperature in described inlet box.
3. the test unit of single cylinder engine simulation complete machine as claimed in claim 2, it is characterized in that, described gas outlet includes an exhaust main and an exhaust branch pipe, described exhaust main is communicated with described simulation pressure charging system, described exhaust branch pipe one end is communicated with described exhaust main, and the other end is communicated with described exhausr port;
The inner side of one end that described exhaust branch pipe is communicated with described exhausr port is provided with one for measuring the back pressure transducer of discharge pressure.
4. the test unit of the single cylinder engine simulation complete machine according to any one of claims 1 to 3, it is characterized in that, the test unit of described single cylinder engine simulation complete machine also includes a cylinder head, on the air intake opening that described cylinder head is covered on described single cylinder engine body and exhausr port.
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| CN201420553287.6U CN204101295U (en) | 2014-09-24 | 2014-09-24 | The test unit of single cylinder engine simulation complete machine |
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| CN201420553287.6U CN204101295U (en) | 2014-09-24 | 2014-09-24 | The test unit of single cylinder engine simulation complete machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111188678A (en) * | 2020-02-11 | 2020-05-22 | 中国船舶重工集团公司第七一一研究所 | Balance type exhaust branch pipe assembly for single cylinder diesel engine |
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2014
- 2014-09-24 CN CN201420553287.6U patent/CN204101295U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111188678A (en) * | 2020-02-11 | 2020-05-22 | 中国船舶重工集团公司第七一一研究所 | Balance type exhaust branch pipe assembly for single cylinder diesel engine |
| CN111188678B (en) * | 2020-02-11 | 2024-04-02 | 中国船舶集团有限公司第七一一研究所 | Balanced type exhaust branch pipe assembly for single cylinder diesel engine |
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