RP-3和RP-5燃油对全环回流燃烧室点火性能影响研究

Ignition Performance of Reverse Flow Combustor Using RP-3 and RP-5 Jet Fuel

关键词:  航空发动机  燃油  回流燃烧室  高空点火  试验

Key words:  Aero engine  Jet fuel  Reverse flow combustor  High-altitude ignition  Experiments

摘要:

为了解RP-3与RP-5燃油对某小型全环回流燃烧室高空点火性能的影响，在低温低压点火试验器上，保持燃油温度与进口空气温度相同，在-40℃，-30℃，-20℃和0℃，空气压力为44kPa，54kPa，62kPa和101kPa条件下，分别对使用RP-3，RP-5燃油的全环回流燃烧室试验件开展点火试验。结果表明：RP-3燃油在试验的低温、低压条件下可以点火成功，RP-5燃油在温度为-40℃的条件下不能点火成功；燃烧室进口空气参数相同、两种燃油均能成功点火时，RP-5燃油的燃烧室点火边界比RP-3燃油窄20%左右，且其平均着火时间比RP-3长6.8s，但从着火成功到全环周向联焰成功的间隔时间比RP-3短2.1s；随着燃烧室进口温度降低，两种燃油在相同状态下的点火边界差别逐渐扩大，燃烧室进口空气压力对点火边界的影响比空气和燃油温度的影响大。

Abstract:

In order to investigate the effects of RP-3 and RP-5 fuel on the high altitude ignition performance of a small annular reverse flow combustor， high-altitude ignition experiments were carried out on a low pressure， low temperature ignition test rig. During the experiments， the inlet air temperature were kept the same as the inlet fuel temperature， the inlet temperature states are： -40℃， -30℃， -20℃ and 0℃， the inlet air pressure states are： 44kPa， 54kPa and 101kPa. The results show that RP-3 ignited successfully under all the named experiment conditions， while RP-5 cannot be ignited when the temperature drop to -40℃. Under the same combustor inlet conditions and when both fuels can be ignited， the ignition boundary of RP-5 is 20% narrower than the ignition boundary of RP-3， and the kernel formation time is 6.8s longer than that of RP-3， but the light-round-time is 2.1s shorter than that of RP-3. Under the same air pressure and air mass flow rate， as the temperature decreases， the difference of ignition boundary between RP-3 and RP-5 is gradually widened. The influence of combustor inlet air pressure to the ignition boundary is greater than the influence of air temperature and fuel temperature.