| 摘要 |
A heat exchanger 11 for use as a cross-flow radiator for an engine cooling system comprises a heat exchanger matrix 12, header tanks 13 and 14 and a side plate 16 arranged at the upper of a pair of opposite side edges 17 of the matrix 12. The matrix 12 comprises tubes 18 which extend in a parallel array between the tanks 13, 14 and cooling fins 19. In use air flows not only between adjacent pairs of tubes but also between the side plate and its adjacent tube. A restrictor plate 21 is arranged on the side plate 16 to restrict the flow of air between the side plate and the adjacent, uppermost, tube 18A. The restrictor plate 21 is in the form of a rectangular blanking plate which blocks the flow of air between the side plate 16 and the uppermost tube 18A over part of its length and allows air to flow through cut-out gaps or castellations 22 over the remainder. This reduces heat transfer through the fins above the uppermost tube 18A by simply blocking the air flow over 50% of their length. The reduced heat transfer allows for an even temperature distribution in the uppermost tube 18A and the tube 18B below and thus reduces stress from thermal expansion. |
