Optimal Placement of Electronic Components to Minimize Heat Flux Nonuniformities

摘要

Isothermalization of satellite panels contributes positively to system thermal performance. Although technologyrninnovations provide one solution path, an alternative method that has not received much attention is simplyrnoptimized component placement. The present approach provides a fast method for determining optimizedrncomponent placement over a rectangular surface that approaches a uniformdistribution of heat flux. The approachrnpresented in this paper is especially useful in situations in which limited or no thermophysical properties and/orrnenvironmental conditions are readily available. The resulting methodology can be used in a variety of industries,rnincludingmicroelectronics and satellite development. A companion Technical Note (Hengeveld, D., Braun, J.,Groll,rnE., andWilliams,A., “OptimalDistribution ofElectronicComponents toBalanceEnvironmental Fluxes,” Journal ofrnSpacecraft and Rockets, Vol. 484, 2011, pp. 694–697. doi:10.2514/1.51063) addresses the problem of distributingrnindividual components to individual panels of a satellite.When combined, the twomethodologies provide an overallrnapproach for minimizing temperature distribution across an entire satellite structure.and Applied Mechanics–Russian Academy of Science atnNovosibirsk, atMach numbers 4 and 6. The transition is detected frompitot pressuremeasurements in the boundarynlayer. Transition onset occurs very near the nose at Mach 4 and is delayed to the middle part of the forebody atnMach 6. For the stability analysis, the mean flow is obtained from Navier–Stokes calculations for the wind-tunnelnconditions.The localmodal linear stability theory, coupledwith the eN method, is applied in a three-dimensional fullyncompressible formulation. At Mach 4, transition is due to a traveling crossflow instability, and a weak oblique firstnmode coexists independently. At Mach 6, the crossflow instability turns progressively to a first mode. N-factors atntransition are around five.