摘要
为探求液力缓速器制动力矩的产生机理,首先,采用全流道式CFD技术对其内流场进行计算,通过基于计算结果的压力云图后处理分析,将液力缓速器转轮壁面归分为压力面、吸力面及池底面;接着,对转轮3种壁面产生的制动力矩进行分类仿真计算,计算结果表明:压力面受到与传动轴旋转方向相反的制动力矩,对传动轴起减速作用;吸力面与池底面则受到与传动轴旋转方向相同的推力力矩,对传动轴起加速作用;3种面的力矩矢量值相加得到转轮壁面所受总制动力矩值,对传动轴起减速作用,这是制动力矩的产生机理;随着转速的上升,压力面力矩变化率与吸力面及弧底面力矩变化率的差距值逐渐增大,这是制动力矩随转速呈现约二次方增长规律的产生机理。
To clarify the generation mechanism of braking torque of hydraulic retarder, whole-flow-passage CFD calculation was conducted on its internal flow field. Based on the calculated result of pressure after cloud processing and analysis,the runner walls of retarder were classified into three types ： the pressure surface, suction surface and arc bottom surface. The simulation and calculation were proceeded on the braking torque generated by the three surface types. The result showed that the braking torque of pressure surface, which was in opposite direction to the rotation of drive shaft, decelerated the drive shaft; the braking torque of suction surface and ate bottom surface accelerated the drive shaft for it was in the same direction to the drive shaft;the total braking torque value of the runner surface, obtained by adding torque vector value of three surfaces, played a decelerating role on the drive shaft, which was the mechanism of braking torque;with the increase of the speed, the gap between the value of pressure side and values of suction side and the arc bottom side gradually widened, which was the mechanism of braking torque along with the rotating speed presenting quadratic growth law.
作者
黄俊刚
张胜宾
李长友
HUANG Jungang ZHANG Shengbin LI Changyou(Guangdong Communication Polytechnic, Guangzhou 510650, China College of Engineering, South China Agricultural University, Guangzhou 510642, China)
出处
《拖拉机与农用运输车》
2017年第1期19-22,26,共5页
Tractor & Farm Transporter
基金
国家自然科学基金(31371871)
液力缓速器关键技术难题研究横向科技项目(KYH18101)
关键词
液力缓速器
仿真
制动力矩
产生机理
分析
Hydrodynamic retarder
Simulation
Braking torque
Generation mechanism
Analysis
