Effect of converging diverging mixing duct geometric parameters on performance of circularly lobed nozzle ejector
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摘要:
目前收缩扩张型混合管结构参数对于圆排波瓣引射器影响的相关研究少，为此首先进行了带有不同结构参数收缩扩张型混合管的圆排波瓣喷管和圆形喷管引射器缩比模型引射性能的实验研究。结果表明，当混合管喉道直径和长度较小且主流质量流量较低时，圆形喷管的引射性能高于波瓣喷管，但随着质量流量增加情况发生逆转；当喉道直径和长度较大时，在实验质量流量范围内和满足主流附壁条件下，波瓣喷管引射性能均高于圆形喷管；随着主流质量流量增大，引射质量流量比存在一个极大值，并且随着喉道直径和长度增大，该极大值也逐渐增大，在所研究模型中极大值的最大增长率为58.5%。接着，本文建立了经过实验数据验证的数值计算模型，误差不大于4.5%。仿真结果表明：随着喉道直径和长度增大，总压恢复系数逐渐增大，喉道尺寸的增大对于流动损失具有改善作用。
Abstract:At present, few studies are devoted to the effect of structural parameters of converging diverging mixing ducts on circularly lobed nozzle ejector. Therefore, several converging diverging mixing ducts with different geometric parameters were designed firstly, and an experimental study on the pumping performance of circularly lobed nozzle and circular nozzle exhaust-ejector scaled-down models was developed. The results showed that when the throat diameter and length of the mixing duct were smaller, the pumping ratio of the circular nozzle was higher than that of the lobed nozzle within lower main flow range, but the situation was reversed as the mass flow increased. When the throat diameter and length of the mixing duct were larger, under the condition of wall-attached main flow, the pumping ratio of the lobed nozzle was higher than that of the circular nozzle within the experimental mass flow range. With the increase of the mass flow, a maximum value of the pumping ratios appeared. Furthermore, as the throat diameter and length increased, the maximum value also gradually increased, and the maximum growth rate was 58.5%. Secondly, a numerical calculation model was established and verified by experimental data, with the error not more than 4.5%. The simulation results showed that the total pressure recovery coefficient increased as the throat diameter and length of the mixing duct increased. Therefore, larger mixing ducts throat diameter and length had an improved effect on flow loss.
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图 3 波瓣喷管与收缩扩张型混合管示意图
Figure 3. Schematic diagram of lobed nozzle and converging diverging mixing duct
图 4 波瓣喷管与收缩扩张型混合管实物图
Figure 4. Photographs of lobed nozzle and converging diverging mixing duct
图 5 实验测量得到的引射质量流量比拟合线图
Figure 5. Curve fitting of pumping ratios measured by experiment
图 10 混合管对称面湍动能云图
Figure 10. Turbulent kinetic energy contours at symmetry plane of mixing duct
图 11 混合管沿程各截面质量流量平均湍动能
Figure 11. Mass flow-average turbulent kinetic energy at different cross-sections along mixing duct
图 13 混合管沿程各截面总压恢复系数
Figure 13. Total pressure recovery coefficient at different cross-sections along mixing ducts
表 1 喷管与混合管组合方式
Table 1. Combinations of nozzles and mixing ducts
喷管 混合管 K1 K2 K3 NL NLK1 NLK2 NLK3 NR NRK1 NRK2 NRK3 
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表 2 波瓣喷管NL的几何参数
Table 2. Geometric parameters of lobed nozzle NL
参数 数值 波瓣段长度L1/d0 8.30 瓣宽b/d0 0.30 波峰圆弧半径r1/d0 0.20 波谷圆弧半径r2/d0 0.20 喷管进口段直径$ \phi $/d0 3.00 喷管出口壁厚d/d0 0.20
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表 3 收缩扩张型混合管K1、K2、K3的几何参数
Table 3. Geometric parameters of converging diverging mixing ducts K1, K2, K3
参数 数值 K1 K2 K3 混合管喉道直径r3/d0 6.3 7.1 7.9 混合管喉道长度L3/d0 38.0 42.3 47.6
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表 4 引射质量流量比实验与仿真结果及误差
Table 4. Results and errors between experiment and simulation of pumping ratios
组合 n 误差/% 仿真 实验 NLK1 1.91 2.00 −4.5 NLK2 2.36 2.45 −3.67 NLK3 2.87 2.92 −1.71 NRK1 1.88 1.94 −3.09 NRK2 2.28 2.20 3.64 NRK3 2.78 2.82 −1.42
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