~AII!!!TheEngineering~ ResourceFor~ Advancing Mobility 400COMMONWEALTH DRIVEWARRENDALE, PA15096 rls 860237 Turbomachinery forTotalTank PowerRequirements SamuelL.Myers,Jr. GarrettTurbine EngineCo. ADivision ofTheGarrettCorp. International CongressandExposition Detroit.Michigan February24-28.1986Downloaded from SAE International by University of Birmingham, Monday, August 20, 2018Theappearance ofthecodeatthebottomofthefirst page ofthispaperindicates SAE'sconsentthatcopiesofthepapermaybemadeforpersona! orinterneluse,or forthepersonal orinternaluseofspecificclients.Thisconsentisgivenonthecon~ dition,however, thatthecoplerpaythestatedperarticlecopyfeethrough the Copyright Clearance Center,Inc.,Operations Center,P.O.Box765,Schenectady, N.Y.12301,forcopying beyondthatpermitted bySections 107or108oftheU.s. Copyright Law.Thisconsent doesnotextendtootherkindsofcopying suchas copying forgeneral distribution, foradvertising orpromotional purposes, for creating newcollective works,orforresale. Paperspublished priorto1978mayalsobecopiedataperpaperfeeof$2.50 undertheabovestatedconditions. SAEroutinely stocksprintedpapersforaperiodofthreeyearsfollowing dateof publication. DirectyourorderstoSAEOrderDepartment. Toobtainquantity reprintrates,permission toreprintatechnical paperorperw mission tousecopyrighted SAEpublications inotherworks,contact theSAE Publications Division. AllSAEp;:pm ~tr!ahW';urnJ aMin;J(XnJ ill/h,'SAl:Gl"bal,ll"bilil)' /);llab:nt SAEGLODALM081UTY DATABASE Nopartofthispublication maybereproduced inanyfonn,in anelectronic retrievalsystemorotherwise, w.ithouttheprior writtenpermission ofthepublisher. ISSNOI48· 7191 Copyright ©1986SocietyofAutomotive Engineers. Inc. Thispaperissubjecttorevision. Statements andopinions ad­ vancedinpapersordiscussion aretheauthor's andarehis responsibility, notSAE's;however. thepaperhasbeenedited bySAlforuniform stylingandfonnat.Discussion willbe printedwiththepaperifitispublished inSAETransactions. I:orpermission topublishthispaperinfullorinpart.contact theSAEPublications Division.Personswishingtosubmitpaperstobeconsidered forpre· sentation orpublication throughSAEshouldsendthemanu­ scriptora300wordabstractofaproposed manuscript to: Secretary, En!,.'inecring Activity Board.SAE. PrintedinU.S.A.Downloaded from SAE International by University of Birmingham, Monday, August 20, 2018860237 TurbomalChinery forTotalTank PowerRequirements SamuelL.Myers,Jr. GarrettTurbine EngineCo. ADivision ofTheGarrettCorp. ABSTRACT Examination oftheweightandpowerrequire­ mentsofmainbattletanksoverthepast50yearsshows severalcleartrends.Tanksarebecoming more"dense" inthattheyarebecoming heavierandsmallerwhile theirpowerrequirements, bothpropulsive andancillary, arerapidlyincreasing. Turbomachines provide high powerandarecompact andlight;therefore, they represent aclassofenergyconversion devicesmeriting seriousconsideration intankdesign. Severaltypesof applicable turbomachines areexamined fromapower densitystandpoint andsometrade-offs affecting their interaction inanintegrated propulsion systemarede­ scribed. Specific comparisons aremadeofactualand conceptual combatvehicleinstallations. HISTORY ANDTRENDS HISTORICALLY, TANKS, ORMOREGENERALLY ARMORED FIGHTING VEHICLES, havebeenpropelled byreciprocating engines. Earlytankswereslow,noisy, andmadenoattempt atstealthorsleekness. Tanks haveevolved considerably inseventy years,andthis evolution, aswithothercomplex systems, hasmoved forward ataneverincreasing rateofchange. The classicdistinction between classesoftankswasthe heavily-protected, slowtankversusthelightly-pro­ tectedhighspeedtank.Mainbattletanks(MBTs)of the1980saffordmoreprotection thananypast"heavy" tankandcanmaneuver asfastasanyprevious "light" tank.Thisdramatic changeinphysical characteristics canbedirectly relatedtothe"density" ofthevehicle. Inthiscontext theterm"density" isappliedtothe relation between theweightofthevehicleandits outsideenvelope volume. Figure1presents animpre­ cisebutusefuldepiction ofthetrendforta