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首页> 外文期刊>Thermal engineering >Experimental Study of the Effect the Basic Geometrical Parameter and the Active Gas Nozzle Expansion Ratio Have on the Performance Characteristics of Supersonic Gas Ejectors Fitted with a Conical Mixing Chamber
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Experimental Study of the Effect the Basic Geometrical Parameter and the Active Gas Nozzle Expansion Ratio Have on the Performance Characteristics of Supersonic Gas Ejectors Fitted with a Conical Mixing Chamber

机译：基本几何参数和活性气体喷嘴膨胀比对装有锥形混合室的超音速气体喷射器性能特性影响的实验研究

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AbstractThe article presents the results from experimental investigations of supersonic gas ejectors equipped with a conical mixing chamber having different lengths carried out for a number of values of the basic geometrical parameter and the active gas nozzle expansion ratio. Certain results obtained from a thermodynamic analysis of the ejectors have been confirmed in a wide range of geometrical parameters, specifically, that there is a possibility to obtain—at the same ejection factor—the first and second critical modes, which differ from each other in the motion pattern of mixing flows and in the efficiency of mixing processes occurring at different passive gas pressures; that there exist three zones in the throttle performance, which correspond to two critical modes and one subcritical mode (it is worthy of noting that the transition from the first critical mode to the subcritical mode that occurs during a growth of back pressure is accompanied by a step-like increase of passive gas pressure, whereas the transition from the subcritical mode to the second critical mode and vice versa occurs without a break in the continuity of changing the ejector’s throttle performance parameters); and that there may be two varieties of the second critical mode: with supersonic and sonic gas mixture flow velocities in the conical chamber outlet section. It is shown that the basic geometrical parameter and the active gas nozzle expansion ratio strongly influence the ejector’s operating and throttling performance characteristics, as well as the mixing chamber optimal length. Experimental dependences of the supersonic gas ejector’s adiabatic efficiency on the conical mixing chamber length are obtained at different values of the basic geometrical parameter and the active gas nozzle expansion factor for the first and second critical modes. It is shown that the optimal mixing chamber length depends on the ejector operating mode. Recommendations for selecting the optimal length of the supersonic gas ejector’s conical mixing chamber within the studied range of parameters for the first and second critical modes are given.
机译： 摘要 本文介绍了对具有不同长度的锥形混合室的超声气体喷射器进行多次实验研究的结果基本几何参数和活性气体喷嘴膨胀比的值。从喷射器的热力学分析中获得的某些结果已在广泛的几何参数中得到证实，特别是，有可能以相同的喷射系数获得彼此不同的第一和第二临界模式。混合流的运动方式以及在不同的被动气体压力下发生的混合过程的效率；在节气门性能中存在三个区域，分别对应于两个临界模式和一个亚临界模式（值得注意的是，在背压增加期间发生的从第一临界模式到亚临界模式的过渡伴随着一个被动气体压力呈阶梯状增加，而从亚临界模式到第二临界模式的转变以及反之亦然，而不会改变喷射器的节气门性能参数的连续性。第二种临界模式可能有两种：在圆锥形腔室出口部分具有超音速和音速气体混合物的流速。结果表明，基本几何参数和活性气体喷嘴的膨胀比强烈影响喷射器的运行和节流性能特性，以及混合室的最佳长度。在第一和第二临界模式的基本几何参数和有效气体喷嘴膨胀系数的不同值下，获得了超声气体喷射器绝热效率对圆锥形混合腔长度的实验依赖性。结果表明，最佳混合室长度取决于喷射器的工作模式。给出了在研究的第一和第二临界模式参数范围内选择超声气体喷射器锥形混合室最佳长度的建议。

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