气氧甲烷溅板式层板喷注器燃烧特性试验分析

采用试验方法分别对单喷嘴和多喷嘴溅板式层板喷注器燃烧特性进行研究,考察不同工况下喷注器面板热载情况,得到不同混合比、不同结构参数对燃烧室压力分布和燃烧效率的影响规律。试验结果表明:混合比对多喷嘴喷注器燃烧室压力影响不大,但对燃烧效率有较大影响。对于单喷嘴喷注器,燃烧效率随着混合比的增加而增高。相同条件下,增大扩张角及出口层宽度有利于提高喷注器燃烧效率,但会引起喷注面板热载增大,各喷注器喷注面板均产生不同程度的变形或失效。该结果对于正确指导层板式喷注器的设计以及筛选喷注器结构具有重要意义。

Experimental analysis on combustion characteristics of gaseous oxygen and methane splash platelet injector

The combustion characteristics of single-element and multi-elements splash platelet injector were studied by experimental methods, the heat load of injector faceplate under different working conditions were investigated, and the effects of different mixing ratios and different structural parameters on combustion chamber pressure and combustion efficiency were obtained. Results show that the mixing ratio of the multi-elements injector has little effect on the chamber pressure, but has a greater effect on combustion efficiency. For single-element injectors, the combustion efficiency improves with the increase of the mixing ratio. Under the same conditions, increasing the expanding angle and the length of the trapezoidal orifice is beneficial to improve the combustion efficiency, but will cause the increase of the thermal load of injector faceplate. The injector faceplate of each injectors has different degrees of deformation or failure. These results are of significance for guiding the design of the platelet injector and screening the structure of the injector.