排灌机械工程学报2026，Vol.44Issue(6)：573-580,8.DOI:10.3969/j.issn.1674-8530.24.0185
小流量工况下尾水管压力脉动抑制
Suppression of pressure pulsation in draft tube under low flow rate condition
摘要
Abstract
In hydro-wind-solar hybrid power generation systems,mixed-flow turbines are required to operate over a broader load range and greater operational flexibility.To mitigate the pressure pulsations within the draft tube under low-load conditions,a three-dimensional full flow path numerical simulation of a giant mixed-flow turbine was conducted using the DES turbulence model.The analysis focused on the vortex rope characteristics within the draft tube at 37.8％load and the internal mechanism of pres-sure pulsation suppression by draft tubes with wave-shaped generatrix and two different protrusion heights were analyzed.The results indicate that the wave-shaped generatrix draft tube can truncate wall vortices and improve the flow state at the draft tube inlet,significantly reducing the amplitude of the pressure pulsations on the draft tube wall,with a maximum reduction of 25.00％.Additionally,it sup-presses upstream-propagating pressure pulsations caused by the wall-attached vortices.Due to the in-creased energy loss caused by the geometric modification of the draft tube,the efficiency decrease re-mains within 0.73 percentage point.Moreover,the study shows that units equipped with wave-shaped generatrix draft tubes exhibit faster attenuation of pressure pulsation amplitude due to the rotor-stator interaction at the draft tube inlet wall,with a maximum reduction reaching 69.98％.关键词
混流式水轮机/涡形态/压力脉动/动静干涉/波浪母线Key words
mixed-flow turbine/vortex morphology/pressure pulsation/rotor-stator interaction/wave-shaped generatrix分类
建筑与水利引用本文复制引用
黄孝文,巩亚平,王秀,王文全..小流量工况下尾水管压力脉动抑制[J].排灌机械工程学报,2026,44(6):573-580,8.基金项目
国家自然科学基金资助项目(52179087) （52179087）
