精密水槽收缩段流场模拟与收缩曲线选型评估  

Numerical Simulation on the Flow Field in Contraction Section of Precision Water Flume and Evaluation about the Contraction Curves

作　　者：王星[1] 沈雪[1] 田于逵[1] 

机构地区：[1]中国船舶科学研究中心水动力学重点实验室,江苏无锡214082

出　　处：《计测技术》2015年第6期24-28,共5页Metrology & Measurement Technology

摘　　要：通过求解RANS方程,数值模拟了精密水槽收缩段的流场特性。针对两种不同出口尺寸不同收缩比的收缩段,选取了三种不同的收缩曲线来进行选型评估。根据壁面是否分离、逆压梯度变化缓和程度、出口速度均匀度,来判断不同收缩曲线的优劣。研究表明:对于出口尺寸为250 mm×20 mm、收缩比为30的收缩段,双三次收缩曲线是最优的;对于出口尺寸为250 mm×10 mm、收缩比为60的收缩段,维氏收缩曲线是最优的。本次数值模拟计算的工作可为精密水槽收缩段优化设计工作提供借鉴。In this paper, the flow field in the contraction section of precision water flume was numerically simulated by solving RANS equations. Three different contraction curves were selected for two different contraction sections with different outlet sizes and different contraction ratios. The three contraction curves were judged by three criteria： the flow was separated or not ; the adverse pressure gradient changed moderately or not; the flow velocity distribution uniformity. The research shows that the bicubic contraction curve is the best for the contraction section with the outlet size of 250 mm ×20 mm; for the contraction section with the export size of 250 mm× 10 mm, the Witozinsky curve is the best. This work can be used as reference for designing the contraction section with optimization.

关 键 词：收缩曲线 数值模拟 流动分离 逆压梯度 速度均匀性 

分 类 号：TB943[一般工业技术—计量学]