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US 8,397,506B1 34 the turbine and compressor cavities whereby a Working ?uid is selectively leaked into the rotor cavity to reduce the tem peraturetherein. In yet another aspect, the invention relates to a method of generatingpoWerforperformingWorkinvolvingprovidinga thermodynamic system including a housing, a turbine posi tioned in a turbine cavity of the housing, a compressor posi tionedinacompressorcavityofthehousing,andanalternator positionedinarotorcavitybetWeentheturbineandcompres sor cavities. The compressor has a high-pressure face facing an inlet of the compressor cavity and a loW-pressure face on anoppositesidethereof,theloW-pressurefacehavingaplu and3depictingapluralityofvanesandapluralityofridgeson rality of ridges. The alternator has a rotor shaft operatively connected to the turbine and compressor, and is supported in the housing by bearings. The method further involves com pressingaWorking?uidbypassingtheWorking?uidacross the compressor, generating a poWer output by passing the compressed Working ?uid across the turbine, and balancing thrustacrossthecompressorbypumpingtheWorking?uid 20 With a plurality of ridges as the Working ?uid passes over the compressor. oppositesidesthereof. FIG. 5 shoWs a detailed vieW of the turbine of FIG. 2 depictingapluralityofcutoutsthereof. FIG. 6 is a ?oW chart depicting a method of generating poWer using the thermodynamic system of FIG. 1. DETAILED DESCRIPTION OF THE INVENTION Presently preferred embodiments of the invention are shoWn in the above-identi?ed Figures and described in detail beloW. FIG. 1 schematically depicts a thermodynamic system 100 for generating poWer. The thermodynamic system 100 includes a Turbo-Altemator-Compressor (referred to herein as a “TAC”) 102 for generating poWer. The TAC 102 has a turbine 104, a compressor 106 and an alternator 108 therebe tWeen.Theturbine104,compressor106andalternator108 are positioned Within a housing 109. ReferringstiltoFIG. 1,thealternator108hasarotorshaft 110. The turbine 104 is operatively connected to the rotor shaft 110 for rotation thereWith. The compressor 106 is also operativelyconnectedtotherotorshaft110forrotationthere With. The alternator 108 is positioned in a rotor (or loW) pressurecavity112Withbearings114andseals182asWillbe describedfurtherherein. TheTAC 102is?uidlyconnectedto?uidcircuit116.As shoWn,the?uidcircuit116hasapluralityofconduits118that form a continuous or closed-loop ?oW path for passage of a Working ?uid. The Working ?uid ?oWs through the ?uid circuit 116 as indicated by the arroWs 120-132, 138-148. The TAC 102 and ?uid circuit 116 form a closed-loop Brayton CycleforgeneratingpoWer. As indicated by arroW 120, the Working ?uid passes into the compressor 106 for compression therein. The Working ?uid ?oWs from the compressor 106 and to the turbine 104 as indicatedbyarroWs122-126.A portionoftheWorking?uid fromthecompressor106maybedivertedbacktothecom pressor as indicated by arroWs 128-132. The Working ?uid passes from the turbine 104 as indicated by arroWs 138-140, and joins the Working ?uid exiting the compressor 106 as it returns to the compressor as indicated by arroWs 130-132. Valves,suchasvalve134and136,may bepositionedinthe ?uidcircuit116toselectivelydiverttheWorking?uidalong thedesiredpath. A portion of the Working ?uid may from time to time selectively be leaked into the rotor cavity 112 as indicated by arroW142(asdescribedfurtherherein).Fluidfromtherotor cavity may selectively and/or passively be released there from. The ?uid may be drained from the ?uid circuit 116 as indicatedbyarroW144.The?uidmay also(oralternatively) be released from the rotor cavity 112 as indicated by arroWs 146,148,andreturnedtothecompressor106asindicatedby arroWs 131, 132. The ?uid may be pumped from the rotor cavity112,usingapump, suchasgasbooster163.Pump 163 In another aspect, the invention relates to a method of generatingpoWerforperformingWorkinvolvingprovidinga thermodynamic system including a housing, a turbine posi tioned in a turbine cavity of the housing, a compressor posi tionedinacompressorcavityofthehousing,andanalternator positionedinarotorcavitybetWeentheturbineandcompres sor cavities. The alternator has a rotor shaft operatively con nectedtotheturbineandcompressor,andsupportedinthe housingbybearings.Therotorcavityis?uidlyisolatedfrom the turbine and compressor cavities via seals. The method further involves compressing a Working ?uid by passing the Working ?uid across the compressor, generating a poWer out putbypassingthecompressedWorking?uidacrossthetur bine,andcoolingtherotorcavitybyselectivelyleakingWork ing ?uid from the compressor cavity into the turbine cavity via at least one selected from the group consisting of the pluralityofseals. 25 30 35 Finally,inanotheraspect,theinventionrelatestoamethod 40 ofgeneratingpoWerforperformingWorkinvolvingproviding a thermodynamic system including a housing, a turbine posi tioned in a turbine cavity of the housing, a compressor posi tionedinacompressorcavityofthehousingandanalternator positionedinarotorcavitybetWeentheturbineandcompres 45 sor cavities. The alternator has a rotor shaft operatively con nected to the turbine and compressor, and supported in the housingbybearings.Themethodfurtherinvolvingcompress ing a Working ?uid by passing the Working ?uid across the compressor,generatingapoWeroutputbypassingthecom pressed Working ?uid across the turbine, and pumping the Working?uidfromtherotorcavitytoselectivelyloWerpres sure therein. These and other aspects of the invention Will be described herein. BRIEF DESCRIPTION OF THE DRAWINGS 50 55 So that the above recited features and advantages of the presentinventioncanbeunderstoodindetail,amoreparticu 60 lar description of the invention, brie?y summarized above, may be had by reference to the embodiments thereofthat are illustrated in the appended draWings. These draWings are usedtoillustrateonlytypicalembodiments ofthisinvention, andarenottobeconsideredlimitingofitsscope,forthe inventionmay admittootherequallyeffectiveembodiments. The ?gures are not necessarily to scale and certain features 65 and certainvieWs ofthe ?gures may be shoWn exaggerated in scaleorinschematicintheinterestofclarityandconciseness. FIG. 1 shoWs a schematic vieW of a thermodynamic system for generating poWer, the system having a Turbo Alternator 5 Compressor(TAC)inaclosedloopBraytonCycle. FIG. 2 shoWs a longitudinal cross-sectional vieW of the TAC ofFIG.1,havingaturbine,compressor,andalternator. FIG.3shoWsadetailedvieWofaportionoftheTAC of FIG. 2 taken along section 3 and depicting the compressor, a thrust bearing, a journal bearing and a seal. FIG. 4 shoWs a detailed vieW of the compressor of FIGS. 2PDF Image | United States Patent Wright et a1. TURBO-ALTERNATOR-COMPRESSOR DESIGN FOR SUPERCRITICAL HIGH DENSITYWORKING FLUIDS
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