Research of the energy increasing means and functional possibilities of the power plants based on the aluminum-air chemical current sources
Propulsion and Power Plants
Аuthors
*, **Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia
*e-mail: dc2mati@yandex.ru
**e-mail: tapopova88@yandex.ru
Abstract
Currently, one of the urgent problems of modern engineering practice is the problem of fuel efficiency. One of the solutions to this problem is to use the heat recovery. The key technology in this case is the heat exchanger (HE). One of the most important components of the designing of the HE is the method of a calculation. The purpose of the study is to develop and verify the three-dimensional calculation method of the HE.
The presented calculation method is based on the software package ANSYS CFX. The basis of the calculation is the method of the numerical simulation of RANS. As a model of turbulence there is the SST model. Basing on the criteria dependencies of the Nu (Re), the verification of the three-dimensional calculation method was performed. As a part of the verification a structured hexa mesh and an automatic tetra mesh were considered. Both of the grids showed satisfactory results in the convergence of the experimental and calculation data. The discrepancy between the experimental and calculated data for Reynolds numbers less than 2000 for the hexa mesh was ~ 20% and in the case of the tetra-mesh it was 25-27%. At the higher Reynolds numbers the convergence of the calculated and experimental data is increasing: for the hexa mesh it is 1-8% and for the tetra mesh — 9-15%. As far as in a practice the creation of the structured hexa mesh takes more time, than creation of an automatic tetra mesh, the automatic tetra mesh was accepted as the most suitable option.
Considered technique is used to obtain a preliminary assessment of the heat transfer surface with the specified geometric parameters and operating modes of the heat exchanger. This reduces the design time and the cost of the full-scale tests.
Keywords:
fuel efficiency, complicated thermodynamic cycles, heat exchangerReferences
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