1. 액체로켓엔진의 이론과 실제 2012. 12. 6 한국항공우주연구원 발사체추진제어팀 임 하 영

2. 1. Introduction

3. 3/23 Payload Insertion

4. 4/23 Space Launch Vehicles Soyuz ProtonZenit Ariane5

5. 5/23 Propulsion System and LRE Propulsion System LRE

6. 2. Basics

7. Thrust Equation C : effective exit velocity C F : thrust coefficient c * : characteristic velocity ε : nozzle area expansion ratio I sp,0 : specific impulse

8.  Typical values of characteristics properties of rocket engines  Mixture ratio

9.  Desirable physical properties  Low Freezing point  High specific gravity  Stability  Heat transfer properties  Pumping properties  Temperature variation  Ignition, combustion, and flame properties  ….  Cryogenic  Hypergolic Propellants

10.  Liquid Oxidizers  Liquid Oxygen  Liquid Fluorine  Hydrogen Peroxide  Nitric Acid  Nitrogen Tetroxide  Liquid Fuels  Hydrocarbon Fuels  Liquid Hydrogen  Hydrazine  Unsymmetrical Dimethylhydrazine (UDMH)

11.  Ideal specific impulse of various propellants combinations

12. Engine Feed Systems

13. Pump Feed Systems  Pump Feed Systems Pump Feed Systems

14.  Booster and 1 st Stage Booster and 1 st Stage Engine applications

15.  Core Stage Core Stage

16.  Upper Stage Engines Upper Stage Engines

17. 3. Components of LRE

18.  Generate thrust by converting the chemical energy into hot gas kinetic energy  Components  Gimbal mount  Injector and Injector Head  Combustion Chamber  Nozzle  Igniter Thrust chamber

19.  Cooling Cooling

20.  Manufacturing Ariane5(Vulcane-1)  Square formed tubes  Spiral wounded to form the nozzle  TIG welded Space shuttle  Conical tubes  Brazed Russia  Sandwich design  Vacuum brazing Laser welding(Vulcane-2)TIG welding(Vulcane-1)

21.  Injector and Injector Head Injector and Injector Head Shear coaxImpinging Swirl

22.  Ignition Ignition  Starting Starting

23. Gas generator and pre-burner  Turbine power  Characteristic data of sample gas generator and pre-burners

24. Turbopump

25.  Drive scheme

26.  Suction Head

27. 4. Example LRE

28. RD-170 Family

29. RD-170 Series

30.  Scheme

31.  Pre-burner Chamber Press.53.5MPa Flowrate836kg/sec Mixture ratio54.3

32.  Thrust Chamber

33.  Booster and Turbopumps OxF Outlet Press60.250.6MPa Flowrate1,792732kg/sec Pump Power129.257.2MW Rotational Speed 13,850rpm Turbine power189.3MW Turbine inlet T772K