Analysis Of Fluid Structure Interaction And Research On Structural Parameter Optimization Of Plate Heat Exchangers

With energy resources dwindling, prices rising and environmental, ecological and social-economic problems deteriorating, more and more countries are fully aware of the importance of energy conservation. Reducing energy consumption in thermal equipment during the heat transfer process and improving energy's efficient utilization are an important measure to reduce the demand for energy and power, save the cost and reduce power loss.With the cold and hot fluid channel model as the research object, numerical simulation method is applied to analyzing fluid structure interaction field of the plate heat exchanger,simulating flow field of the plate heat exchanger and structure (stress-strain) field of the corrugated board sheet and applying the nonlinear programming quadratic line (NLPQL)algorithm to optimize the structure parameters of corrugated board and fluid inlet velocity.The heat transfer's simplified model that is more in line with plate heat exchanger's actual application situation is established, that cold and hot double fluid channel model consisted of three pieces of corrugated plate and cold and hot fluid that is not doped flow in their respective flow channel. The heat transfer process is cold and hot fluid's coupled heat through intermediate corrugated board.With the cold and hot fluid channel model as the research object, FLUENT software is applied to simulate the characteristics of the flow, heat transfer and resistance of plate heat exchanger. The characteristics of the fluid flow between the plates is understood from the analysis the velocity field, stress field and temperature field, lucubrating the influence rules of cold and hot fluid inlet velocity, angle of the corrugated board sheet and corrugated section height ratio on the characteristics of heat transfer, pressure drop and drag coefficient.Based on FLUENT software's single-phase fluid flow analysis of coupling heat transfer model of double fluid channel, ANSYS Workbench software is applied for the static structure analysis of corrugated plate heat exchanger, taking the data obtained from the fluid analysis as a fluid load to the corrugated board sheet. The stress, strain and total deformation of plate heat exchangers generated from the effect of fluid dynamic load are analyzed.The minimum pressure drop and minimum dissipation generated from the heat transfer process of plate heat exchanger are taken as the objective function for research on structural parameters of the heat exchanger plates. First, the design of experiments method is applied for the collection of samples of experimental parameters, namely angle of the corrugated board sheet, corrugated section height ratio and fluid velocity, calculating the target of all sample points. Second, response surface methodology (RSM) is applied to fit functional relationship between input parameters (design variables) and output parameters (the objective function).Finally,the NLPQL algorithm is applied to search a set of Pareto optimal solutions which meet the objective function in the entire design space.Based on plate heat exchanger's double fluid channel model, fluid structure interaction analysis and multi-objective optimization of structural parameters of the heat exchanger plates are researched which are of great significance for the improvement of heat transfer performance of plate heat exchanger and improving energy efficiency.