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UnitedStatesPatent0 l r'ce 3,276,5l5 Patented Oct. 4, 1966 2 3,276,515 GAS TURBINE REGENERATOR James H. Whit?eld, Madison Heights, Mich, assignor to Chrysler Corporation, Highland Park, Mich, a corpo ration of Delaware Filed Apr. 9, 1964, Ser. No. 358,544 9 Claims. (Cl. 165-40) This invention relates to improvements in the construc tion of a rotary disc-type regenerator for an automotive gas turbine engine. ‘ One common disc-type regenerator comprises a core or matrix having a multitude of parallel axially extending gas passages arranged about a central hub or axis of acter which is self~supporting without recourse to supple mental radial reinforcing spokes or to a reinforced rim. As explained more fully in the copending application of Huebner, Serial No. 204,462, ?led June 22, 1962, the most effective heat transfer passage is the thinawalled straight tube of long and narrow cross sectional shape. Attempts have been made heretofore to fabricate such a regenerator matrix from thin corrugated stock wound spirallyorconcentricallyaroundthecentralhub. The juxtaposed convolutions of the corrugated stock were bonded to each other to complete a plurality of elongated axially extending gas passages. However, the unusual and comparatively large forces acting on the thin walls of the gas passages caused rupturing of the core and rotation and con?ned within a peripheral rim. The 15 consequence leakage and ine?icient operation of the axially opposite ends of the gas passages are arranged in parallel planes perpendicular to the axis of rotation and comprising end faces of the matrix through which two oppositely directed streams of gases at different temperaturesandpressuresareconducted. Forexample, 20 andadaptsthesameasthesolestructuralsupportforthe a sector shaped seal in sliding and sealing contact with each of the opposite end faces of the regenerator matrix partitions the latter into two sectors. Comparatively cool high pressure inlet air is directed toward one end face of the matrix at one sector thereof, thence through 25 a number of axially extending layers of ?at stock ar that sector to be preheated by the hot regenerator matrix. The preheated air is then directed to a combustion cham ber where fuel is added and burned, the hot combustion products being then directed through the turbine stages oftheenginetodrivetheturbinerotors. The comparatively hot low pressure exhaust gases from the rotors are then directed through the other sector of the regenerator matrix in ‘the direction axially opposite to the inlet air ?ow, whereby the latter regener~ atormatrixisheated. Rotationoftheregeneratorcarries its heated sector continuously to the region of the ?rst mentioned sector to receive the comparatively cool gas ?ow to preheat the inlet gas as aforesaid, and thereby to cool the regenerator. ranged either spirally or concentrically around a central hub and spaced radially by strips of corrugated stock. The corrugated stock comprises continuous circumferen tiallyspacedconvolutionseachhavingagenerallyradially 30 extendinglongsidebondedorbrazedatitsendstothe ?at stock, opposite ends of each long side of the convolu tions being spaced from one of each of the next circum ferentially adjacent long sides by generally circumferen tially extending short ends of the convolutions. The radially extending long sides of the convolutions supported at their ends by the flat strips serve as numerous tensile and compressive members somewhat in the manner of discontinuous spokes extending from the central hub to the peripheral rim to carry the various forces acting Such a regenerator is commonly known as a counter 40 on the matrix and to hold the hub and rim in proper ?ow regenerator and is feasible for use in automotive gas turbine engines. Among the requirements for such a regenerator, overall compactness is of a very high order. Compactnessisachievedinpartbyformingthe regenerator matrix with a multitude of tiny thin-walled gaspassages. Asthesidewallthicknessoftheindividual gas passages decreases, the overall structural rigidity of the regenerator also decreases. Furthermore, the thin side walls are subject to large stress from comparatively small loads distributed from thermal and pressure dif ferencesandmechanicalforces. Rotationoftheregen erator in addition causes cycling of the loads which aggrevates the tendency of the thin gas passage walls to fail by fatigue. relationship and to give the matrix its necessary rigidity without recourse to supplemental reinforcing spokes. The radially elongated gas passages arranged side by side locate a number of passages across the seal in the di rectionofthepressuregradient. Thusthepressuredif ferential from one passage to the next and the resulting stress in the long passage side walls of the convolutions isminimized. Discontinuouspressuregradientsalongthe seal resulting from defective sealing or splits in the matrix will be carried across the short strong ends of the con volutions. Essentially, then, the con?guration allows small pressure differences across the long weak sides of the convolutions and higher pressure differences, result ing from possible defects and the con?guration of the seal, across the stronger short ends of the convolutions. Other objects of this invention will appear in the follow ing description and appended claims, reference being had to the accompanying drawings forming a part of this speci?cation wherein like reference characters designate In consequence ithas been a commonplace to provide the regenerator with a plurality of radial spokes con necting the central hub to the peripheral rim and rein forcing the regenerator matrix, as indicated by a long established line of art represented by numerous patents, suchas:Ljungstrom,PatentNo. 1,762,446;Boestad,Pat 60 correspondingpartsintheseveralviews. ent No. 2,229,691; Gates, Patent No. 2,438,851; Karlsson, Patent No. 2,680,008; Mudersbach, Patent No. 2,852,234; andBubniak,PatentNo.2,893,699. Suchspokes,‘how ever, interfere with the manufacture of the regenerator structure,addappreciablytoitsweight,decreaseitsuse 65 sectorseal,withtheenginehousingremoved. able gas flow area and efficiency, and increase its overall FIGURE 3 is a fragmentary enlarged plan view of a size and cost. An important object of the present invention is to regenerator core or matrix of the above general char circle4ofFIGURE 2. provideanimprovedconstructioninagasturbineengine 70 rimportionofthematrix,takensubstantiallywithinthe regenerator. It is accordingly another object to provide an improved regenerator construction of the foregoing character which optimizes the use of the long narrow gas ?ow passages matrix. A more speci?c object is to provide such a regenerator in combination with a diametric seal across opposite end faces of the regenerator matrix, the matrix comprising FIGURE 1isafragmentaryschematicmid-sectional view through the axis of rotation of the regenerator of a gasturbineengineembodyingthepresentinvention. FIGURE 2isaplanviewshowingtheregeneratorand portionofthematrixillustratedinFIGURE 2. FIGURE 4isafragmentaryenlargedplanviewofthePDF Image | WHITFIELD GAS TURBINE REGENERATOR
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