Experimental investigation on pressure oscillations caused by direct contact condensation of sonic steam jet
Experimental investigation on pressure oscillations caused by direct contact condensation of sonic steam jet
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DOI：
10.1016/j.expthermflusci.2013.09.020
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发表时间：
2014
影响因子：
3.2
通讯作者：
Binbin Qiu;Simiao Tang;Junjie Yan;Jiping Liu;D. Chong;X. Wu
中科院分区：
文献类型：
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作者：
Binbin Qiu;Simiao Tang;Junjie Yan;Jiping Liu;D. Chong;X. Wu
进行了一项实验研究来研究水池中音速蒸汽射流的压力振荡。喷嘴出口直径为8毫米，蒸汽质量通量为298-865千克/（平方米秒），水温20-70℃。分析了压力振荡的主频率和振幅。建立了压力振荡幅度的理论模型，并给出了半经验相关性来预测压力振荡的无量纲均方根（R.M.S）幅度。压力振荡主要是由蒸汽速度δu、传热系数δ手网汽水界面δS的变化引起的。压力振荡主频率随着水温的升高而降低，随着蒸汽质量流量的增加，CO区压力振荡主频率升高，SC区压力振荡主频率降低。压力振荡的幅度与主频率成反比。主频率不随x/deandr/de的变化而变化。但振幅随着x/deandr/de的增加而减小。建议使用经验相关性来根据实验数据预测无量纲均方根振幅。预测与实验吻合良好，误差在±30%以内。
An experimental study has been carried out to investigate the pressure oscillation of the sonic steam jet in a pool. The exit diameter of the nozzle was 8 mm and the steam mass flux was 298–865 kg/(m2s), water temperature 20–70 °C. The dominant frequency and amplitude of pressure oscillation have been analyzed. A theoretical model on pressure oscillation amplitude was set up and a semi-empirical correlation was given to predict the dimensionless R.M.S (root mean square) amplitude of pressure oscillation. The pressure oscillation is mainly caused by the variation of steam speedδu, heat transfer coefficientδhand net steam-water interfaceδS. The dominant frequency of the pressure oscillation decreased with the increase of the water temperature while increased in CO region and decreased in SC region with the increase of the steam mass flux. The amplitude of the pressure oscillation is inversely proportional to the dominant frequency. The dominant frequencies did not change with the variation ofx/deandr/de. But the amplitudes decreased with the increase ofx/deandr/de. An empirical correlation was suggested to predict the dimensionless R.M.S amplitude based on the experimental data. The predictions agreed well with the experiments, and the discrepancies were within ±30%.