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Study on Flow Resistance under Natural Circulation

Author: YangHuiTao
Tutor: GaoZuoZhen
School: Harbin Engineering University
Course: Thermal Power Engineering
Keywords: Natural circulation Forced circulation Swing Resistance characteristics
CLC: TK124
Type: Master's thesis
Year: 2010
Downloads: 96
Quote: 0
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Abstract


In this thesis , the experimental and theoretical studies of water flow resistance characteristics of single-phase natural circulation under steady-state conditions and swinging conditions . Experimental study of deionized water as the working fluid , the test section is arranged on one side of the swing sets of stainless steel tube . The theoretical analysis of the state of the natural circulation flow resistance of the fluid in the vertical tube channel characteristics and the working fluid within the test section velocity distribution under conditions of steady-state and swing . The compensation of the pressure difference in the loss of the heating power of the experimental section in the heated state and swing state analysis reasoning . Were forced circulation flow resistance characteristics of experimental and natural circulation flow resistance characteristics of test conditions not swing and swinging conditions , the main analysis and comparison of natural circulation and forced circulation flow resistance characteristics , differences and connections , increased power under natural circulation conditions change and the mechanism of the process of the process and reduce the power of resistance characteristics while natural circulation flow resistance characteristics of different swing cycle and angle changes . Describes the phenomenon of a typical experiment , using the average of experimental data processing , analysis of the reasons for the resistance characteristics change under steady-state conditions , increasing power and reducing power , fitting a natural for this experiment circulating turbulent area of smooth tube friction loss formula ; swing state , different average flow , different swing angle , resistance characteristics of the natural cycle of rolling period were compared and analyzed . The experimental results show that the steady state under the natural circulation state , the increased power and reduced power of the experimental section of the heating process and the process is different , the reduced power during the test section frictional resistance with a lag . In the state of Swing natural circulation , increase the cycle and increase the swing angle has the same effect , and are exacerbated by the intensity of the test section swing , leading to the test section drag coefficient increases, compared with the steady-state flow decreases .

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CLC: > Industrial Technology > Energy and Power Engineering > Thermal engineering, heat > Thermal Engineering Theory > Heat Transfer
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