CAJ | 학술논문

为提高离心泵运行性能，设计了3种弯管前置扰流子。利用计算流体动力学软件FLUENT中提供的多重参考系（MRF）模型，采用标准k-ε模型和SIMPLE算法求解不可压缩Navier-Stokes方程，对带有不同进口弯管及扰流子的离心泵在设计工况下进行全流场数值模拟。结果表明：离心泵外接弯管上90°弯头的转向半径 R 和入口直管段长度L对泵的运行效率均有影响，其中转向半径的影响更为明显，通过适当的增加R和L可有效地提高离心泵的运行效率，效率最高可达81.98%。而在弯管前端安装扰流子后，泵的入口流动状态可以得到很好的改善，进而提高离心泵的运行效率和抗汽蚀性能，其中以 CJ-3406翼型扰流子性能最佳，效率最高可提高4%，而采用3307b翼型扰流子时有效汽蚀余量最高可提高近0.2 m。该文为实际生产中如何改进入口管路和提高离心泵的运行性能提供了新思路。
위제고리심빙운행성능，설계료3충만관전치우류자。이용계산류체동역학연건FLUENT중제공적다중삼고계（MRF）모형，채용표준k-ε모형화SIMPLE산법구해불가압축Navier-Stokes방정，대대유불동진구만관급우류자적리심빙재설계공황하진행전류장수치모의。결과표명：리심빙외접만관상90°만두적전향반경 R 화입구직관단장도L대빙적운행효솔균유영향，기중전향반경적영향경위명현，통과괄당적증가R화L가유효지제고리심빙적운행효솔，효솔최고가체81.98%。이재만관전단안장우류자후，빙적입구류동상태가이득도흔호적개선，진이제고리심빙적운행효솔화항기식성능，기중이 CJ-3406익형우류자성능최가，효솔최고가제고4%，이채용3307b익형우류자시유효기식여량최고가제고근0.2 m。해문위실제생산중여하개진입구관로화제고리심빙적운행성능제공료신사로。
As an important kind of fluid conveying equipment, a centrifugal pump is widely used in modern industrial production, but the issue of its low operation efficiency was not solved effectively, and at the same time a large amount of energy is consumed by a centrifugal pump every year, a huge burden has been brought on economic development. In order to improve the operation performance of a centrifugal pump, with the idea of improving the inlet flow field of a centrifugal pump, three kinds of bend forward turbolators were designed. First of all, the blade and central body of the turbolator and the centrifugal pump were modeled by Pro/E, and then meshed in Gambit. Finally, the whole flow field of a centrifugal pump with an imported bend was simulated under the design conditions by using a MRF model which was supported by Fluent, both the standard k-ε turbulence model and the SIMPLE method were adopted to solve the Navier-Stokes equations for incompressible flow. According to the simulation results under different import lines, it was concluded that both the turning radius (R) of the 90 degree elbow and entrance straight tube length (L) of the bend had an influence on operation efficiency, and that the former was more obvious. The efficiency of a centrifugal pump can be effectively improved by increasing R, and it will be first increased and then decreased with the increasing L, the maximum efficiency can be reached when L=D, so the operation efficiency can be improved by an appropriate increase of R and L, the maximal efficiency can be up to 81.98%. After installing a turbolator, the inlet flow state of a pump got a considerable improvement, the efficiency of centrifugal pump was improved, and from all kinds of turbolator, the CJ-3406 had the most obvious effect, it can increase the efficiency by 4%. This indicates that the efficiency can be better improved when the aerofoil curve changes gently. With a turbolator, the work space of a centrifugal pump can be saved, so the turbolator can be better served for actual production. At the same time, the speed direction is perpendicular to the impeller inlet when the fluid flow through the pipe elbow. Centrifugal pump inlet flow can be more uniform and axisymmetric flow can be involved in the import which ensures the uniform distribution of pump inlet pressure. What is more, both the pressure and velocity of the import are improved, so the performance of anti-cavitation of a centrifugal pump is enhanced, the NPSHa can be increased by 0.2 m with the turbolator of 3307b. This article provides a new train of thought for improving the inlet line and the operation performance of a centrifugal pump in actual production.