彭云晖1,高伟2,张弛2,3,林宇震2,3.超临界碳氢燃料的射流特性研究[J].航空发动机,2019,45(2):59-64 |
超临界碳氢燃料的射流特性研究 |
Investigation on Jet Characteristics of Supercritical Hydrocarbon Fuel |
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DOI: |
中文关键词: 超临界 碳氢燃料 射流特性 流量特性 航空发动机 |
英文关键词:supercritical hydrocarbon fuel jet characteristics mass flow rate characteristics aeroengine |
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中文摘要: |
针对未来先进航空发动机的超临界燃油喷射混合问题,采用纹影法对超临界正十烷(n-decane)/ 正戊烷(n-pentane)混
合物在静止环境中的射流激波结构进行试验,同时采用理论分析的方法研究了射流的相变途径和流量特性。纹影照片显示,在试验
工况下射流在喷口附近呈现出马赫波等激波结构,燃料的压力是激波结构的主要影响因素。理论分析表明:在混合物的临界点附
近,燃料压力较高时更有可能导致相变。由于物性的不同,大分子与小分子碳氢燃料的相变途径存在一定的差异,小分子燃料在喷
射过程中更容易发生冷凝。采用1 维等熵计算方法可以较精确地计算高温高压碳氢燃料的流量。 |
英文摘要: |
The shock structures of supercritical n-decane/n-pentane mixtures into atmospheric environment was experimentally
investigated by Schlieren method,and the phase transition path and mass flow rate characteristics of fuel jets were theoretically studied.
Flow visualization showed that internal shock structures are observed near the nozzle exit for the test conditions and the fuel pressure has
the primary influence on shock structures. Theoretical analysis revealed that fuel condensation phenomenon occurs more possibly at higher
fuel pressures near the critical point and the condensation of small hydrocarbon fuel is more likely to occur than large hydrocarbon fuel
because of the different thermodynamic properties. The mass flow rate of hydrocarbon fuel at high temperature and high pressure conditions
can be calculated accurately using one-dimensional isentropic calculation method. |
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