电控燃料喷射大功率气体发动机的试验研究

针对大功率气体发动机的进气管回火和扫气过程燃料流失等问题,建立一种气体燃料电控喷射装置,进而实现大功率气体发动机的燃料多点顺序间歇供给。搭建发动机试验平台进行发动机启动、怠速稳定性、各缸均匀性调整以及增减负荷的试验。结果表明,气体燃料电控喷射装置可以有效地实现燃气量的实时独立调节,发动机运行平稳,验证了技术的可行性。通过应用气体燃料电控喷射装置,增大发动机扫气重叠角和提高压缩比,可进一步改善发动机性能。

Experimental study on heavy-duty gas engine with electronically controlled fuel injection device

An electronically controlled gas fuel injection device was presented aiming at the disadvantage of backfire and fuel loss of heavy-duty gas engine. The multiple-point sequential and intermittent fuel injection was achieved. The engine test-bed was developed to test the engine start performance and idle stability. The uniformity control of each cylinder and load changing were also tested. The experimental results show that the gas fuel mass can be independently controlled by electronically controlled injection device. The engine runs smoothly and the feasibility of the technology was verified. Furthermore, with the application of electronically controlled injection device, the performance of the engine can be improved by increasing the scavenging overlap angle and the compression ratio.