Experimental Study on Excitation of Heat Exchanger Tubes Based on Turbulence Power Spectrum

In the steam generator, anti-vibration bars are often provided to support the tube bundle. Due to the non-linearity of the support, the fluid-solid coupling simulation of large-scale tube bundles supported by the anti-vibration bars will bring great trouble. In order to solve this problem, this paper conducts experiments on the heat exchange tube based on the turbulent power spectrum to generate the excitation force. By changing the support form, the force of the lift and the direction of the drag and the ratio of the force, the excitation of the heat exchanger tube is researched. The results of the displacement response, the contact force and friction force distribution, and the contact angle distribution provide reference for the subsequent model simplification. Experiments show that the contact rate increases with the increase of the excitation force, and the contact force and the friction force increase with the increase of the excitation force. When the heat exchange tube contacts with the anti-vibration bars, the contact angle is mostly less than 45°, more than 50% of the contact angle is less than 45°. The work rate of the tube at the edge is greater than the work rate of the tube in the center.

TESTING LABORATORY UNIT FOR RESEARCH ON HEAT TRANSFER OF HORIZONTAL HEAT EXCHANGE TUBE

Tests of a laboratory setup for the study of new methods of heat transfer enhancement were performed. The experimentally determined heat transfer coefficients are in good agreement with those calculated by known equations, which indicates the reliability of the research methods used.

TESTS OF FLAT HYDROTURBINE ROTATING A HEAT EXCHANGE TUBE

Tests of a flat-blade hydraulic turbine designed to rotate a heat transfer tube at a laboratory bench have been performed. The dependence of the rotational speed of a hydraulic turbine in a vertical tube on the flow of water is determined.