CAJ | 학술논문

设计了一种具有圆锥形入口的小喉径临界流喷嘴，采用Fluent进行数值模拟实验，研究其几何结构即入口角、入口段长度、喉部长度、扩散角和扩散段长度等参数对流出系数的影响。通过仿真分析对圆锥形入口喷嘴的几何结构进行了设计和优化。结果表明，喉部长度与入口角大小对流出系数影响较大，喉部长度与流出系数为负线性相关；流出系数随入口角的增大，先增大后减小，在17.5°时达到最大值；流出系数随扩散角的增大而增大，增长率却随扩散角的增大而减小；当扩散角大于3°，扩散段长度对流出系数的影响不明显。
설계료일충구유원추형입구적소후경림계류분취，채용Fluent진행수치모의실험，연구기궤하결구즉입구각、입구단장도、후부장도、확산각화확산단장도등삼수대류출계수적영향。통과방진분석대원추형입구분취적궤하결구진행료설계화우화。결과표명，후부장도여입구각대소대류출계수영향교대，후부장도여류출계수위부선성상관；류출계수수입구각적증대，선증대후감소，재17.5°시체도최대치；류출계수수확산각적증대이증대，증장솔각수확산각적증대이감소；당확산각대우3°，확산단장도대류출계수적영향불명현。
A small diameter critical venturi nozzle with conical inlet is designed. The influence on the discharge coefficient caused by the geometrical structure, such as inlet angle, inlet length, throat length, divergence angle and divergence length, is investigated by numerical simulation by using Fluent. The geometrical structure of critical venturi nozzles with conical inlet is optimized according to the numerical simulation data. The results show that the throat length and the inlet angle have important influence on the discharge coefficient. The relationship is negative linear correlation between discharge coefficient and throat length. The discharge coefficient increases as the divergence angle increasing, however, the grow rate has the opposite trend. The divergence length has no obvious effects on the discharge while the divergence angle exceeds 3°.