摘要
土工离心机运行时会产生热量,热量引起机室内温度升高,会影响土工模型试验的效果,因此需要分析和控制机室温度.在顶板或侧壁开有通风口的土工离心机,由于运行时存在空气压力差和流速沿通风口方向的分量,机室内空气会自动由通风口排出,影响机室温度.基于一套土工离心机的实测转速、功率和机室温度数据,结合机室温度的理论公式,计算、分析了自然排风量及其效应和特征,给出了相应的结果 .比较不考虑与考虑自然排风量时的理论结果及实测结果,指出:自然排风量随转速增大而增大;自然排风对机室温度具有很强的影响;等效排风速度与通风口处空气旋转线速度之比基本不变,可作为自然排风的一个特征量.这些研究和结果为土工离心机机室温度的准确预估和通风设计提供了概念指导和理论依据.
Heat is generated while a geotechnical centrifuge operates,which makes the temperature rise in the chamber and affects the availability of the geotechnical model test. Therefore the temperature in the chamber needs to be analyzed and controlled. As for the geotechnical centrifuge whose top and side walls are holed,due to air pressure difference and the component of flow velocity along the holes,the air will flow out of the camber through the holes and the camber temperature will be affected. By fitting experimentally measured data of rotational velocity,power and camber temperature of a geotechnical centrifuge,the heat balance temperature of the camber for each operation case is obtained. Meanwhile,the relation between heat balance temperature and natural air exhaust rate is developed by using the law of energy conservation. Based on the experimentally obtained heat balance temperatures and the relation,the natural air exhaust properties are calculated and analyzed. The comparison of theoretical results with or without natural air exhaust and experimental results indicate that natural air exhaust rate increases with the increase of the rotational velocity,while natural air exhaust affects strongly the camber temperature,and the ratio of natural air exhaust velocity to the circumferential flow velocity of the air at the hole is basically a constant and can be defined as a characteristic variable. The obtained experimental results can improve the accuracy of camber temperature calculation and ventilation design.
出处
《绵阳师范学院学报》
2017年第11期1-7,共7页
Journal of Mianyang Teachers＇ College
关键词
土工离心机
机室
稳态热传导
机室温度
自然排风
geotechnical centrifuge, camber, stable heat conduction, temperature in chamber, natural air exhaust
