The Electronically Controlled Strategy And Optimization Analysis Of Gas Nozzle Test Platform

At present, China’s auto production and ownership increase. gas fuel enginewhich is cleaner than traditional gasoline and diesel fuel engine got the in-depth studyby scholars, and it gets continuous progress in technology. Among them, being one ofthe important parameters of the gas fuel engine calibration, the fuel gas nozzle flowcharacteristic has been paid much attention. its measurement precision has beenrestricted to further improve of the gas fuel engine performance. To obtain the highaccuracy of gas nozzle flow characteristic is the basis of engine calibration.According to the above problem, to obtain the high accuracy of gas nozzle flowcurve data, this paper thoroughly studies the domestic and foreign existing gas engineand gas nozzle characteristics, and then put forward a kind of gas nozzle flowcharacteristic measuring method which basis on the principle of drainage andweighing from the Angle of the optimization of existing gas nozzle flowmeasurement method, realizing high precision in measuring gas nozzle flowcharacteristic in theory.In order to achieve high efficiency and automation in practice, the gas nozzleflow test platform which is based on this method has been designed and established,and the computer is used to complete the test platform automation and visualizationmonitoring, so as to achieve precise control of key parameters in measurementmethod, such as regulated gas supply, exhaust systems, surface position, etc.Validation results showed that the test platform test result is affected by the gasnozzle outlet pressure fluctuations. Aiming at this problem, in order to furtherimprove the measurement precision, a CFD simulation analysis model is set up tocomplete the optimization analysis of gas nozzle outlet pressure fluctuations in theprocess of measuring. And put forward an optimization scheme and apply it to theexisting test platform. Test results show that, using the optimized scheme can betterrealize the stability of the nozzle outlet pressure.Finally, on the basis of the test platform, the validation of the accuracy of the testplatform is completed through the quantitative measurement method. Test resultsshowed that the optimized scheme can improve the stability of the test platform, and the measurement precision of control under0.5%, realizing the accurate measurementof gas nozzle flow characteristic. In engineering applications, the application of themeasurement platform on a LPG engine gas nozzle flow measurement, successfullyobtains the gas nozzle flow characteristic curve. The measurement data has highstability and consistency, and conforms to the requirements of the gas enginecalibration.Through these studies, the gas nozzle flow characteristics measurement methodhave received verification in theory and application, and the gas nozzle flow platformmeasurement accuracy can meet the needs of gaseous fuel engine calibration.