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1 JAXA Research and Development Report Japan Aerospace Exploration Agency
2
3 Development of a Hypersonic Turbojet Engine Controller Designed for a Flight Experiment* Hiroaki KOBAYASHI* 1, Hideyuki TAGUCHI* 2, Shujiro SAWAI* 5, Kazuhisa FUJITA* 3, Takayuki KOJIMA* 1, Keiichi OKAI* 1, Motoyuki HONGO* 1, Daisaku MASAKI* 1, Tadao ISHIZUKA* 2, Kenya HARADA* 4, Yusuke MARU* 5, Hisao FUTAMURA* 1 Ryoji YANAGI* 1 Abstract The pre-cooled turbojet engine is one of the most promising candidates for the propulsion system of hypersonic transport. A notable feature of this engine is to use an air pre-cooling device using liquid hydrogen fuel as a coolant in order to protect the turbo-machinery from aerodynamic heating under hypersonic flight conditions. JAXA s recent model of the pre-cooled turbojet engine called S-Engine has by meters square cross section, a total length of 2.67 m, and a mass of 134 kg. It produces a thrust of 122 kgf by firing liquid hydrogen fuel in afterburner, its compressor rotational speed is 80,000 rpm and its compressor pressure ratio is six. This engine is developed for the flight test at Mach 2 condition integrated with a balloon-launched missile-like vehicle. This paper describes pre-flight verification test results of the engine control system including liquid hydrogen supplying system. Keywords: Hypersonic, Liquid hydrogen, Turbojet, Control system JAXA kgf Received 21 January 2009 Jet Engine Technology Research Center, Aerospace Research and Development Directorate Supersonic Transport Team, Aviation Program Group Innovative Technology Research Center, Aerospace Research and Development Directorate Unmanned and Innovative Aircraft Team, Aviation Program Group Department of Space Systems and Astronautics, Institute of Space and Astronautical Science ISAS
4 2 JAXA-RR [1] C kgf ATREX kg S m 2.67 m 134 kg 6 1 kg/s 80,000 rpm 119 kw
5 3 2 BOV:Balloonbased Operation Vehicle [2,3] 2 40 km m m 3 2 CFRP Carbon Fiber Reinforced Plastic GFRP Glass Fiber Reinforced Plastic 50 N 8 8Hz CFRP MPa 3 MPa 58 g/sec sec 1 40 km 2
6 4 JAXA-RR AB 11 g/sec 1200 K 47 g/sec 200 K 2000 K 4 2 3MPa SUS 316 L mm mm 200 mm 200 mm 3 4
7 5 2 Í Í Í Í Í Í Í Í Í Í Í Í
8 6 JAXA-RR /hour mm K MPa 3.5 MPa mm SUS 304 L 4mm SUS 304 L 48 kg 23 kg 10 kg 15 kg MPa 3.5 MPa MPa 1
9 飛行実験用極超音速ターボジェットエンジン制御装置の開発 図7 図8 7 液体水素配管レイアウト 搭載推薬供給系配管図
10 8 JAXA-RR MPa Swagelok SS-8 UW 8 AR 2000 Inco718 CV [4] d 16 W/m/K 2 Fanning 3 f Blasius 4 l d 32 l/d η h η c 5 h c in out kw ATREX /8 ATREX Re d Reynolds Re x D Reynolds 4 1 hg kw/m 2/K ATREX mm 0.15 mm SUS 316 L mm 2
11 µ m U SUS 316 L 6 NTU number of transfer unit Cp h Cp c A m
12 10 宇宙航空研究開発機構研究開発報告 図9 JAXA-RR 熱交換器設計図 6 総括熱伝達率 h は 燃料側熱伝達と壁および霜層の熱 7 8 抵抗を無視し Zukauskas による式 7 を用いて計算す る[5] Re 数は管の間における平均流速 u を用いて定義さ 5 上記によって推定した温度効率を ATREX-500 用プリク れる Re 数が 10 オーダーとなるプリクーラの場合 ーラの実験で得られた実績値と比較したところ 推定値 Zukauskas 式の定数は c 0.27 m 0.63 n 0.36 とな に対する実績値の修正係数は 0.75 となった 推定誤差の る 熱交換器が完全な向流型であると仮定すると 冷媒 要因としては 熱交換器の形式が完全な向流型ではない 側と空気側の温度効率は それぞれ熱移動単位数と水当 こと 空気の偏流の影響 着霜の影響などが考えられる 量比 R を使って式 8 のように表現できる 空気側の圧力損失は プリクーラ伝熱管の間における平
13 11 飛行実験用極超音速ターボジェットエンジン制御装置の開発 均流速で定義した動圧に比例するとし 係数には ATREX- 燃焼に耐えることができるため 無冷却構造をとる し 500 用プリクーラの実績値として 80 を採用した 冷媒側 かしながら 可動構造を有するランプ部は 冷却構造と 圧損については 蒸発器の評価手法と同様である 以上 する必要があり プリクーラ下流の水素による再生冷却 を元にプリクーラの性能評価計算を実施した結果を表 3 を利用する アフターバーナー壁面の冷媒水素は 上流 に示す ランプを冷却した後 可動プラグ冷却系と下流ランプ冷 却系に分岐する 可動プラグ冷却水素 アフターバーナ 6 アフターバーナー壁面冷却 ー壁面冷却用水素の 22 は エンジン出口でブリード アフターバーナーは ノズルスロート面積調節用の可 され燃焼には寄与しない 下流ランプ冷却水素は 下流 動プラグ付きランプ部と コの字断面のカウル部より構 ランプを冷却した後 再熱燃焼器の噴射器に供給される 成される カウル部には ACC 複合材 Advanced Carbon- 上流ランプと下流ランプには SUS 316 L 材を 特に熱負荷 Carbon Composite が適用され 短時間であれば 2000 K の の厳しい可動プラグにはニッケル合金 Inco625 を適用 した アフターバーナー壁面の伝熱設計にあたってガス 側熱伝達率の評価には 局所熱伝達率が 単位断面積あ たりの質量流量 m/a に比例するモデル Bartz 式 9 を 用いて推定した D として 流路断面の等価直径を用い る Tg は淀み温度 Tw は壁面温度 M は局所 Mach 数を 表す 9 スロート高さ 24.3 mm のときのガス側熱伝達率は 平行 部で 0.45 kw/m2/k ノズルスロート部で 1.2 kw/m2/k と なった 冷媒側の熱伝達率評価 および圧力損失評価に ついては 蒸発器の項で述べた方法と同様である 図 11 に アフターバーナー壁面冷却構造の設計結果を示す エンジンの定格作動点において 上流ランプと下流ラン プ SUS 316 の最大壁温度 要求 800 K 以下 は 797 K 可動プラグ Inco625 の最大壁温度 要求 1000 K 以下 は 894 K 冷媒出口温度 要求 800 K 以下 は 579 K 冷 媒圧損 要求 1.0 MPa 以下 は 0.43 MPa となり 設計要 求を満足した 2.3 搭載計測制御装置の設計 極超音速ターボジェットエンジンを気球利用型実験機 に搭載した形態で燃焼実験を行うための 搭載計測制御 装置の設計について述べる 図 10 熱交換器写真 上 蒸発器 下 プリクーラ 表4 項目 熱物性値 大気 コア系燃焼ガス AB 系燃焼ガス 冷媒水素 熱伝導率 W/K/m 気体定数 J/kg/K 定圧比熱 J/kg/K 粘性係数 Pa*s プラントル数
14 12 JAXA-RR Ah National Instruments Compact RIO FPGA Field Programmable Gate Array 11 5
15 13 6 Ò
16 14 JAXA-RR VenturCom Real-Time ETS OS LabVIEW MPa 31 Pressure Systems ESP ESP CANdaq CANdaq HUB TCP-IP ESP 1Hz ESP AD 50 Hz 1 MPa 9 16 K Analog Devices AD 595 TTIN-B TTOUT-B 1223 K OR 14 TEOUT PEOUT PFIN OR 13 PPCOUT TPCOUT OR 15 PNCO TNCO PTCI-1 5 PSI-1 3 TO PU-05, PU-03 2 FV KAZ-740 P 0-10 V µ CS µ CS 1-4 VDC 4 vol. 4V mm 700 mm Ethernet 1 TTL 4 Ethernet UDP TTL 3 TTL 2 A B High A B High 15
17 15 飛行実験用極超音速ターボジェットエンジン制御装置の開発 図 14 エンジン制御機器パネル 上 気密室搭載状態 中 パネル外観 下 機器配置 緊急排液 B のどちらかが Low レベルになった場合 試験 中止と判断して緊急排液モードに遷移し 液体水素容器 の緊急排液 および配管系統のヘリウムガス置換を行う エンジン制御機器搭載パネルと搭載推薬供給系 およ 図 13 計測点配置図 びエンジン間の電気接続ラインとコネクタの配置を図 16 に示す 気密隔壁 気密室後部隔壁 水密隔壁 機体下 ーケンスを開始する なんらかの原因でインターロック 面隔壁写真 の写真とコネクタ配置状況を 図 17 図 18 がかかり エンジン起動シーケンスをリセットする場合 に示す 隔壁コネクタの仕様を表 8 に示す は 実験開始 A もしくは実験開始 B を Low レベルに戻す ことで エンジン側搭載計算機の状態は待機モードとな 2 エンジン制御方式 る また 飛行中に なんらかの原因で燃焼実験を中止 コア系の燃料制御方式として 燃焼温度スケジュール する場合には 機体側は 緊急排液 A および緊急排液 B を制御目標とするフィードフォワード付き PID 制御を採 信号を Low レベルとする エンジン側は 緊急排液 A 用した 観測量は タービン入口温度 TTIN-B Kx10-3
18 16 JAXA-RR QIC 1 50 Hz 15 sec 15 sec
19 17 20 sec PID 0.3 Ti[min] L*2.2 Td[min] L* ,000 rpm 2 kw DC 24,000 rpm
20 18 JAXA-RR YGE YGE-200 TTL AB Parker ibe 231 F RS 232 C 3 PFT 3.5 MPa RV D JAXA MPa 2 90 HV
21 /hour 3 /hour 3MPa 60 g/sec CORNES DODWELL 133 L/min Hz 20 sec 1.6 MPa 3 MPa 1.5 MPa 44 3MPa 22 sec JAXA QIC-1 QIC-131 CV QIC CV CV PFT PRV-1 CV QIC-1 22 CV JAXA 965 K 0.4 kg/sec 2.2 MPa 24.5 g/sec
22 20 JAXA-RR CV JAXA 1 kg/sec 3MPa mm 50 mm K K 40 K 23 24
23 21 25 Kx PRV-1 3MPaG PID min min JAXA 7 50 QIC-1 PRV-1 2MPaG TTIN-B N 27 L JAXA 19 1,046 PID K
24 22 JAXA-RR ,000 rpm 29,000 rpm JAXA 2 60 m Nm 3 /min CV kw DC 30 60,000 rpm 3 20 kpa 10 kpa [6,7] 50 kpa 64.5 sec Mach1.96, 20 km
25 23 9 Test.1 Test.2 Test.3 Test kpa 66.5 sec Mach1.99, 19 km K 2-50
26 24 JAXA-RR kN 58 g 2 16 GS JAXA-RR (2005). 2 Vol.56, No.654, pp , Fujita, K., Sawai, S., Kobayashi, H., Tsuboi, N., Taguchi, H., Kojima, T., Okai, K., and Sat o T., Precooled Turbojet Engine Flight Experiment Using Balloon-Based Operation Vehicle, Acta Astronautica, Vol.59, No.1-5, pp , Zukauskas, A., Ulinskas, R. : Banks of Plain and Finned Tubes, Heat Exchanger Design Handbook, 2, Fluid Mechanics and Heat Transfer, Hemisphere Publishing Corp., Was-
27 25 ington, D. C., 1983, pp JAXA-RR (2006). 7 Okai, K., Shimodaira, K., Kurosawa, Y., Zimmer, L., Taguchi, H. and Sato, T., Combustion and Altitude Ignition Tests in a Small Hydrogen-Fueled Combustor with Radial Injection Pre-Mixers for a Hypersonic Engine, IGTC 2007 Tokyo TS-133, Proceedings of the International Gas Turbine Congress 2007 Tokyo, Tokyo Japan, December 2007.
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F7-0 Design of F7-0 High Bypass Turbofan Engine for P- Maritime Patrol Aircraft 空 空 空 空 F7-0 P- ファ ( : ) 00 量 量 F7-0 6 tf F7-0 The F7-0, a turbofan engine for the P- maritime patrol aircraft operated by
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