CAJ | 학술논문

利用示踪气体浓度值分析圆形喷口非等温冷射流对周边环境空气的卷吸运动。利用恒温恒湿实验室进行喷口射流模型实验。对比了传统方法和示踪气体法卷吸量测量结果，并对喷口射流沿程卷吸量与卷吸系数的变化规律进行分析。实验数据表明：利用示踪气体浓度值沿程变化测量射流卷吸量的方法是可行的。在惯性力起主导作用的射流运动中，雷诺数Re是影响射流卷吸效应强弱的主要准则，随着出口Re数增大，卷吸量逐渐增加；当出口雷诺数Re ＞15000时，流量增大系数几乎不变。
이용시종기체농도치분석원형분구비등온랭사류대주변배경공기적권흡운동。이용항온항습실험실진행분구사류모형실험。대비료전통방법화시종기체법권흡량측량결과，병대분구사류연정권흡량여권흡계수적변화규률진행분석。실험수거표명：이용시종기체농도치연정변화측량사류권흡량적방법시가행적。재관성력기주도작용적사류운동중，뢰낙수Re시영향사류권흡효응강약적주요준칙，수착출구Re수증대，권흡량축점증가；당출구뢰낙수Re ＞15000시，류량증대계수궤호불변。
The paper used tracer gas concentration to analyze the entrainment movement of ambient air by the non-isothermal cold jet coming from the circular nozzle.The model experiment of nozzle jet has been conducted in the thermostatic and humidistatic laboratory.It compared the result of the entrainment vol-umes derived from the traditional method and the tracer gas method, and analyzed the patterns of entrain-ment volume and the entrainment coefficient along the jet curve.The results show that the method of measuring the jet entrainment according to on-way changes of tracer gas concentration is feasible.The Reynolds number is the dominant physical factors in the movement of jet where the inertial force plays a dominant role.With the increase of Re number, the volume of entrainment increases gradually, when Re>15000, the flow increase coefficient almost keep the same.