Research of Hydrodynamics and Temperature Characteristics of Some Parts of Heat Exchange Equipment
Temperature pulsations are sometimes connected with low speed of forced convection of a heat-carrier and, as consequence, the secondary flows connected with natural convection of a heat-carrier occur 1. Temperature pulsations of heat exchanging surfaces cause corresponding, sometimes rather considerable fluctuations of thermal stress, that in turn can give rise to fatigue failure of some parts of the equipment. That’s why it’s necessary to take into consideration temperature pulsations while designing heat exchange equipment. To carry out the experiments is of great importance because numerical simulations of heat-transfer processes are complex in heat exchange equipment. Experimental research has been done on experimental stand FT-80 which represents three circuits. There is the heat-carrier in the first circuit, in the second one-feed water, in the third one-technical water. The experimental model is made as a collector assembly placed in the shell. Outside the collector assembly heating heat-carrier, inside it-cooling technical water. The experimental model has got 4 ways to deliver heating heat-carrier of the 1st circuit to the collector assembly. Research of temperature fields has been carried out by micro thermocouples located on a heat exchange surface of a collector assembly and in a heat-carrier flow. Experimental research has been done in the following range of parameters: mass velocity of heat-carrier 141,5÷283 kg/m2s, mass velocity of cooling water, 311÷500 kg/m2s, heat-carrier input temperature 200÷300℃, heat-carrier pressure 10÷14 МPа. It has been proved, that all ways of delivering heat-carrier to collector assembly result in temperature pulsations of a heat-carrier flow which are transferred to a heat exchange surface. It is connected with secondary flows of heat-carrier. The peculiarity of a flowing round of collector assembly by a heat-carrier flow has been defined and the quantitative characteristics of transient temperature field are determined. Experimental data are tabulated for verification of numerical codes.
heat exchange equipment verification of numerical codes temperature pulsations computational fluid dynamics thermal physics investigations
Dmitriev SergeyDmitriev Sergey Spiridonov Dmitry Dmitrieva Tatyana Bolshukhin Mikhail
Nizhniy Novgorod State Technical University Minina st., 24, Nizhny Novgorod, 603950 Russia Joint Stock Company <<Afrikantov OKB Mechanical Engineering>> Burnakovsky proezd, 15, Nizhny Novgoro
国际会议
上海
英文
1139-1149
2010-10-10（万方平台首次上网日期，不代表论文的发表时间）