Determination of low pressure gas injector valve flow factor

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Abstract

During the time when exhaust toxicity effects have an important role in the means of transport, engines are very often converted to be supplied by alternative fuel. The most popular alternative fuels used in transport vehicle engines are liquefied petroleum gas and compressed natural gas. In both cases, the fuel dosage component is the low pressure gas injector. There are many design constructions for these injectors, i.e. plunger, plate or membrane. The most popular are plunger injectors. In the course of mathematical modelling of the combustion engine fuel supply system operation, it is necessity, among other things, to determine the flow parameters of components, mainly the values of flow factors. The article presents the results of plunger injector experimental flow tests at various opening levels. For this purpose, the original laboratory stand and flow meter were used. An original method for determining the cross-section flow area for a plunger valve has been proposed. The determined coefficient is universal and it is used in the case of plunger injectors. Tests at varying degrees of opening are static, because the flow is steady and the plunger is stationary. An attempt was made to validate the results of static tests under dynamic conditions. For this purpose, our own research method was used, consisting of emptying the tank with a pressure sensor mounted under dynamic injector operation. The results of measurements are flow pressure graphs. They reflect the cyclical operation of the injector. In the final stage experimental and model waveforms were compared (mean absolute percentage error did not exceed 0.5%). Theoretical values were calculated on the basis of a simplified flow model, taking into account the coefficient and field of free flow from static tests. As a result, the applicability of the parameters obtained from static tests for dynamic applications was assessed.

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APA

Szpica, D. (2020). Determination of low pressure gas injector valve flow factor. In Engineering for Rural Development (Vol. 2020-May, pp. 721–729). Latvia University of Life Sciences and Technologies. https://doi.org/10.22616/ERDev.2020.19.TF167

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