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Research on Critical Flow of Water under Supercritical Pressures in Nozzles 被引量:3

Research on Critical Flow of Water under Supercritical Pressures in Nozzles
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摘要 An experiment on critical flow of water was conducted in two nozzles of 1.41 mm in diameter and 4.35 mm in length with rounded-edge and sharp-edge respectively, covering the ranges of inlet pressure of 22.1-29.1 MPa and inlet temperature of 38-474 ℃. More than 200 data points were obtained and the characteristics and parametric trends were investigated. In the region of near and beyond pseudo-critical temperature the thermal-equilibrium is dominant, and the flow rate can be estimated by the modified homogeneous equilibrium model. In the below pseudo-critical region the results exhibit scattered feature as a result of hysteresis effect in the onset of vaporization, characterizing a bifurcation behavior. This effect is more significant in the nozzle with sharp-edge, especially at higher pressure. For temperature well below the pseudo-critical point, the flow is not at critical condition and the flow rate can be represented by the Bernoulli equation reasonably.
出处 《Journal of Energy and Power Engineering》 2012年第2期201-208,共8页 能源与动力工程(美国大卫英文)
关键词 Critical flow CHOKING NOZZLE supercritical pressure THERMAL-EQUILIBRIUM reactor safety. 超临界压力 临界流量 喷嘴 入口温度 临界点温度 压力范围 临界温度
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参考文献10

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