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A Performance Diagnosis of the 1939 Heinkel He S3B Turbojet

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A Performance Diagnosis of the 1939 Heinkel He S3B Turbojet Proceedings of ASME Turbo Expo 2004 Power for Land, Sea, and Air June 14-17, 2004, Vienna, Austria GT2004-53014 A Performance Diagnosis of the 1939 Heinkel He S3B Turbojet. C Rodgers FASME [email protected] ABSTRACT. The historical development of the world’s first pure SFC Specific fuel Consumption jet propelled aircraft, the Heinkel He 178, and its T Temperature turbojet the He S3B has been extensively TIT Turbine Inlet Temperature documented, however only limited descriptions of U Tip Speed the engine and component aero-thermo-dynamic V0 Turbine Spouting Velocity = √√√2g Had performances have, as yet, been published in open Va Turbine exit axial velocity English literature. W Airflow, or relative velocity The basic He S3B engine flowpath configuration of a ∆∆∆ Difference radial compressor mounted back-to-back with a ηηη Efficiency radial inflow turbine, intrigued the author as one ωωω Angular Velocity excellent example of the pre WW11 radial turbomachinery ingenuity and expertise, to the Subscripts extent that it prompted this diagnosis. ad Adiabatic Recognizing that some of the historically quoted c Compressor HeS3B performance data may be dubious, attempts d Diffuser have been made to coalesce data from multiple crit Sonic conditions sources into a more consistent account by i Inlet conducting a detailed engine performance analysis. n Nozzle HeS3B engine performance characteristics are re- s Static created based upon predicted meanline component t Turbine, or total maps derived from engine drawings and supporting Note all angles relative to the axial plane data recently published by AIAA in his biography “Dr Hans von Ohain -Excellence in Flight”. HISTORICAL REVIEW. Predicted engine performance parameters at both a five minute and maximum continuous rating are The development of the Heinkel He S13B turbojet itemized, together with thrust/rpm/temperature is extensively documented in Refs 1-8, as the variations at part speed conditions. propulsion unit for the world’s first pure jet propelled aircraft to fly, the Heinkel Hs 178. NOMENCLATURE. The He S3B turbojet was the culmination of the CFS Volume Flow pioneering efforts of Dr Hans von Ohain, Conner (1), D Diameter in combination with his primary associates Dipl.-Ing g Gravity Wilhelm Gundermann, and Max Hahn, all sponsored H Head under the patronage of Dr Ernst Heinkel. JPT Jet pipe temperature Test demonstration of its predecessor the He S1 Mn Mach number hydrogen fuelled turbojet engine in April of 1937 N Rotational Speed rpm exhibited 130 kpf of thrust at 10000 rpm, thereby Ns Specific Speed =ωωω CFS0.5/(gHad)0.75 solidifying the design principles and combustion q Work factor = ∆∆∆H/ U2 technology enough to proceed with an improved RMS Root mean square engine, the He S3A, for flight testing in 1938 RWT Turbine Normalized Inlet Flow Parameter mounted beneath a He 118 dive bomber. √√√ √√√ = (Wt Ti /An Pi)/ (Wt Ti /An Pi )crit 1 S = Strahltriebwerk = Jet engine 1 Copyright © 2004 by ASME Following several flight tests the He 3A was ENGINE FLOWPATH DESCRIPTION . accidentally destroyed upon landing as a result of fire stemming from a leaking fuel line. The He S3B flowpath is shown schematically on In May 1939 a further improved engine the He S3B Fig 1, which is a composite of both the data from was installed in the historic Heinkel He 178 aircraft, Conner (1) and Koos (6). An annular inlet injested but the developed thrust was marginal for aircraft air into a 14 bladed stator-less inducer stage. The takeoff. The compressor diffuser and turbine nozzle inducer functioned basically to generate prewhirl vanes were subsequently modified, which increased affront of a 16 bladed radial impeller, in addition to thrust sufficiently to qualify the aircraft for first providing a slight pressure rise. The individual fllght demonstration. radial impeller blades were made of duralumin, retained in a steel hub, and attached to the back disc On August 27 1939 the He 178 made its historic six with rivet stems. The impeller blades were slightly minute flight, piloted by Erich Warsitz who quotes curved at the entry by sheet metal forming of the in Conner (1) he “flew at slightly below 600 km/hr”. leading edge, to ostensibly match the prewhirl angle Peter (3), quotes a much lower speed of 400 km/hr. from the separate inducer rotor. Discharge air from the impeller entered a small Major He S3B engine performance at the 5 minute diameter ratio radial vaneless space, followed by a rating2, privately communicated to the author from sheet metal 37 vane radial diffuser with its exit E.Prisell (2) are listed below in Table 1. surrounded by a circular standoff collar. This collar had a splitter, which appeared to divert most of the Table 1. He S3B Major Performance Data. flow axially forward, whilst directing the residual Sea level 15 C flow aft to serve as combustor dilution air and inner liner wall cooling. The forward flow was turned aft Rating 5 minute 180 degrees, via 16 peripheral semi-circular chutes Pressure ratio 2.8 which discharged the flow across fuel vaporizer Airflow kg/s 12.6 grids at the entry to the primary zone of the annular RPM 11600 combustor. A fraction of the forward flow was also Static Thrust kgf 500 used to provide outer liner cooling. TIT C 697 SFC kg/kgf.hr 1.6 Fuel was first routed from an electric driven fuel pump to the aft turbine bearing housing to provide In researching the historic records the author cooling, and then metered to four circumferentially uncovered several errors in reported data and cross spaced fuel lines which fed sixteen vaporizer spray sections, including the rotational speed, exterior bars at the annular combustor entry. diameter, blade numbers, airflow, pressures, The combustion products discharged from the compressor scroll configuration. These errors have combustor into the annular bend and accelerated hopefully been corrected in this paper as a result of into the 27vane radial turbine nozzle, subsequently the detailed performance diagnosis presented impinging upon the 12 bladed turbine rotor. The herein. blade shape of the turbine exducer was formed in A prime ambiguity example appears to be the similar fashion to the impeller blades by bending rotational speed, frequently published as 13000rpm over the tip sections. This rudimentary method of but specifically quoted by Dr von Ohain in Conner blade forming was presumably constrained by (1) as 11600rpm. A probable explanation for this expediency, and manufacturing limitations. The ambiguity is discussed later. turbine blades were also rivet attached to disc backplate. A photograph of the He S3B replica in the Deutsches Museum Munich is shown on Fig 2. 2 kurzfristig ung 5 min = limit time 5 minutes The rotating assembly was supported by two bearings. A deep grove split inner race ball bearing was located in the central housing between the inducer and impeller, and lubricated with oil from 2 Copyright © 2004 by ASME Fig 1 He S3B Turbojet Cross Section Fig 2 HeS3B Replica, courtesy Deutsches Museum 3 Copyright © 2004 by ASME an encapsulated container. The aft roller bearing higher than 700 C (1292 F) matched to the 11600 was of the grease pack type with extra cooling from rpm rated speed by appropriate jet nozzle sizing. the fuel supply. There were significant problems It is remarkable that the fabricated rotor assembly adequately lubricating the relatively small bearings with separate sheet metal blades, attached with De as a result of the axial thrust and un-balance loads Laval roots in the hubs, and riveted to the back created by the large diameter compressor and discs, apparently survived operation at the turbine rotors. Apart from continued combustor maximum thrust conditions, particularly the refinements the second major focus of the turbine. Some industrial centrifugal compressor development effort was achieving increased flow and impellers and fans were still manufactured using higher component efficiencies. this technique as late as the 1950’s, but operating at Dr Ohain conceived the key to more efficient rather lower tip speeds and temperatures. Apparent operation at higher compressor inlet relative Mach too is that the He S3B rotor assembly had no numbers (inherent with increased airflow capacity), intervening heat shield between both rotor discs, was a separate small blade camber axial inducer. which may have caused radiation heat pickup from the hot turbine on to the impeller disc backface. Sir Frank Whittle (4) chose an alternate solution to increase airflow without encountering higher PRELIMINARY CYCLE ANALYSIS. inducer Mach numbers by selecting a double-sided centrifugal impeller. Whittle’s solution did however A simple Brayton cycle model of the HeS3B turbojet require development of inlet turning vane cascades was first created, assuming constant compressor and to improve inlet flow mal-distribution effects. turbine gas properties. The relatively large sheet metal casing and flimsy flanges could potentially Engine starting was accomplished with pressurized have been susceptible to leakage between the air fed to impingement nozzle(s) mounted on the compressor and turbine, thus an external leakage turbine housing close to the turbine rotor tip. equal to the fuel flow input plus 1% was assumed, (i.e., Wt/Wc=0.99). The model was used to initially COMPONENT PERFORMANCE PREDICTION. assess the compressor and turbine efficiencies that could have satisfied the overall performance level of The analytical procedure utilized to re-create the He Table 1, using TIT as a parameter. Cycle results are S3B turbojet performance comprised patching the shown on Fig 3 indicate that if the TIT was no historic data with current turbomachinery higher than 700C the approximate adiabatic centrifugal compressor and radial inflow turbine 1D compressor and turbine efficiencies were plausibly prediction procedures, in an iterative loop. An initial of the order 73% and 83% respectively.
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