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首页> 外文期刊>International Journal of Heat and Fluid Flow >Effect of nozzle inlet geometry in high temperature hydrocarbon liquid jets
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Effect of nozzle inlet geometry in high temperature hydrocarbon liquid jets

机译：喷嘴入口几何形状在高温烃液体射流中的影响

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An experimental study was conducted to investigate the effect of orifice inlet geometry on discharge and cavitation characteristics of high-temperature hydrocarbon liquid jets. The fuel was heated to 553 K (280 °C) using an induction heater, at an upstream pressure of up to 1.0 MPa, and injected to atmospheric pressure conditions through variously chamfered plain orifices of diameter 0.7 mm and length 4.3 mm. Hydraulic characterization in terms of fuel temperature was carried out by introducing the discharge coefficient, and the macroscopic internal flow characteristics were correlated with Reynolds number and cavitation numbers. The variation of Cdwith respect to Tinjin the non-cavitating region below the boiling point shows that Cdincreases with increasing chamfer depth C, but the Cdtrend nearly converges to a maximum value when the relative chamfer depth reaches 20% of the orifice diameter. In the cavitating region, on the other hand, the effect of chamfer depth on the mass flow rate or Cddiminishes as the cavitation becomes stronger with increasing Tinj. The plot of Cdwith respect to Re shows laminar to turbulent transition in high chamfer depth cases at ΔP = 0.3 MPa, and this reveals that the internal flow in the current orifice configuration at relatively low velocity conditions remains laminar even at high Re for higher chamfer depths. Furthermore, the curves of Cdwith respect to Re for various chamfer depths at each ΔP condition merge when Tinjis very high, implying that the trend of Cdwith respect to Re at high Tinjconditions becomes independent of chamfer depth. The variation of Cdwith respect to cavitation number for various chamfer depths converges gradually under cavitating conditions, and this suggests that the degree of cavitation (as quantified by the cavitation number) inside fuel injectors of different chamfer depths becomes closer as Tinjreaches very high values. It can, therefore, be concluded that because of mass flow choking the hydraulic characteristics represented by the discharge coefficient of high temperature hydrocarbon liquid jets become independent of chamfer depth in strong cavitation conditions as Tinjincreases beyond the boiling point, and are determined only by the pressure difference between Pinjand Psatat Tinj.
机译：进行了实验研究，以研究孔口入口几何形状对高温烃液体射流的排放和空化特性的影响。使用感应加热器在最高1.0 atMPa的上游压力下将燃料加热到553 upK（280 C），并通过直径为0.7 mm和长度为4.3 variousmm的各种倒角平孔注入大气压条件。通过引入排放系数对燃料温度进行水力表征，并将宏观内部流动特性与雷诺数和空化数相关联。 Cd相对于沸点以下非空化区域Tinjin的变化表明，C倒角随倒角深度C的增加而增加，但当相对倒角深度达到孔口直径的20％时，Cd趋势几乎收敛至最大值。另一方面，在空化区域中，随着Tinj的增加，当空化变得更强时，倒角深度对质量流率或Cddiminish的影响会减弱。 Cdwith相对于Re的图显示了在高倒角深度情况下在ΔP= 0.3 MPa时层流向湍流过渡，这表明即使在较高倒角深度的Re较高的情况下，在相对较低的速度条件下，当前孔口构造中的内部流动仍保持层流。 。此外，当Tinjis非常高时，在每个ΔP条件下，Cd相对于Re的曲线在每种ΔP条件下会合并，这意味着Cd相对于Re的趋势在高Tinj条件下变得独立于倒角深度。在空化条件下，不同倒角深度下Cd随空化数的变化逐渐收敛，这表明随着Tinjreaches值非常高，不同倒角深度的喷油器内的空化程度（由空化数量化）变得越来越近。因此，可以得出结论，由于质量流量的抑制，在强空化条件下，当Tinjin升高超过沸点时，高温烃液体射流的排放系数所代表的水力特性变得与倒角深度无关，并且仅由压力决定。 Pinjand Psatat Tinj之间的区别。

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