Predicting Mass Flow Rate of Supersonic Flow from Pintle-Type Hydrogen Injector; [초음속 유동에 대한 핀틀형 수소인젝터의 질량유량 예측]

초록

Hydrogen engines with low-pressure direct injection are in the spotlight as a sustainable energy system. The direct-injection system with a low-pressure fuel supply has adopted pintle-type hydrogen injectors to guarantee sufficient flow rates. Predicting the mass flow rate of the pintle-type injector precisely is essential; however, no concrete prediction models have been suggested so far. Thus, this study introduced a methodology to predict the mass flow rate of supersonic flow from pintk-type hydrogen injectors based on the compressible flow theories of convergent-divergent nozzles. The prediction accuracy of the methodology is examined by comparing the prediction results with experimental results under various injection and ambient pressure conditions with various gases (nitrogen and helium). The results confirmed the methodology's prediction accuracy over 92 %, which would predict hydrogen mass flow rates from the results of surrogate gases and in various injection and ambient conditions. © 2024 Korean Society of Automotive Engineers. All rights reserved.

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