GB843923A - Apparatus in which heat exchange takes place between fluids - Google Patents

Abstract

843,923. Making heat-exchangers and rocket motor combustion chambers; milling. DE HAVILLAND ENGINE CO. Ltd. Dec. 20, 1957 [Jan. 17, 1957], No. 1850/57. Classes 83 (2) and 83 (3). [Also in Groups XII, XXVI and XXXIII] A heat-exchange surface, which may be part of a rocket motor combustion chamber, or an aircraft nose or spinner, approximates to a surface-of-revolution and is formed of a number of longitudinal members, each of which is formed with two spaced parallel flanges which form an open-sided groove, the members being disposed side-by-side in a circumferential assembly with the two parallel flanges of each member lying generally parallel to tangential planes at adjacent parts of the surface-of-revolution, the edges of each member being joined in fluid-tight manner to a corresponding part of the next-adjacent member so as to form a number of fluid-conducting passages extending contiguously side-by-side in a generally axial direction over the surface. The rocket combustion chamber shown comprises a series of H-section strips 13, each shaped by bending to conform to the longitudinal cross-sectional profile of the chamber, the parallel flanges 15, 16 of the strips being disposed tangentially, and the adjacent abutting edges 20, 21, 23, 24 of the flanges being secured together by brazing or welding so as to form a series of longitudinallyextending passages 25 through which cooling fluid such as one of the propellant ingredients is caused to flow. Annular inlet and outlet cooling-fluid-manifolds 26, 27 are disposed at the ends of the passages. The edges of the flanges of the strips are machined by milling before assembly so that they will, upon assembly, lie in planes radial to the chamber axis. In a second embodiment the wall is built up of U-section strips, the parallel flanges of the strips being disposed in tangential planes, and the edges of one strip being secured to the web portion of the adjacent strip. Milling.-Each strip 13, Fig. 6, is placed on an inclined table 17 and machined at 21, 20, on a plane 18 corresponding to a radial plane of the combustion chamber, and is then reversed and machined on the edges 23, 24 at the same angle, the web 14 being also on a radial plane. Specification 794,660 is referred to.