论文部分内容阅读
针对冲压发动机转级过程中可能出现的混压式进气道不起动现象,提出了一种新的瞬间射流调节方式,并开展了非定常数值模拟。结果表明,利用储气腔内高压气体的瞬间喷射,可以实现进气道不起动流场的再起动,且气体质量最少需要0.011 kg,射流作用时间最多持续27 ms,具有较高的工程应用价值。深入研究发现,射流引起的进气道溢流是实现再起动的主要机理,射流流量大小及变化速率是决定进气道能否再起动的关键因素。射流流量变化速率越小,初始流量越大,进气道越容易再起动。最后利用微元法得到了射流流量随时间变化的函数关系式,并和数值模拟值进行了对比,分析了射流总温、储气腔容积和出口面积等设计参数对射流流量及进气道再起动特性的影响。
Aiming at the phenomenon of non-starting of the mixed-pressure inlet which may appear during the process of ramjet engine, a new method of instantaneous jet adjustment is proposed and unsteady numerical simulation is carried out. The results show that the instantaneous injection of high pressure gas in the gas storage chamber can be used to restart the inlet non-actuated flow field, and the gas mass needs a minimum of 0.011 kg and the jet action time lasts for a maximum of 27 ms, which has high engineering application value . It is found that the jet overflow caused by the jet is the main mechanism for restarting. The jet flow rate and the rate of change are the key factors that determine whether the air intake can restart. The smaller the rate of jet flow rate change, the larger the initial flow rate, and the easier the inlet port will restart. Finally, the relationship between the jet flow rate and time is obtained by using the micro-element method. Compared with the numerical simulation, the design parameters such as the total jet temperature, the volume of the air chamber and the outlet area are analyzed. Effect of starting characteristics.