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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Society of Propulsion Engineers
Journal Basic Information
Journal DOI :
The Korean Society of Propulsion Engineers
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Volume & Issues
Volume 18, Issue 6 - Dec 2014
Volume 18, Issue 5 - Oct 2014
Volume 18, Issue 4 - Aug 2014
Volume 18, Issue 3 - Jun 2014
Volume 18, Issue 2 - Apr 2014
Volume 18, Issue 1 - Feb 2014
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A Computational Study on the Shock Structure and Thrust Performance of a Supersonic Nozzle with Overexpanded Flow
Bae, Dae Seok ; Choi, Hyun Ah ; Kam, Ho Dong ; Kim, Jeong Soo ;
Journal of the Korean Society of Propulsion Engineers, volume 18, issue 4, 2014, Pages 1~8
DOI : 10.6108/KSPE.2014.18.4.001
Overexpanded flow of an axisymmetric thruster nozzle is numerically simulated to investigate effects of nozzle pressure ratio (NPR) on the shock structure and thrust performance. The Reynolds-averaged Navier-Stokes equations with k-
SST turbulence model are solved utilizing FLUENT solver. As the NPR is raised, thrust performance monotonically increases with the shock structure and flow-separation point being pushed toward the nozzle exit. It is also discussed that the flow structure at nozzle-exit plane which is immediately affected by a position of nozzle-interior shocks and expansion waves, has strong influence upon the thrust performance of thruster nozzle.
Fabrication and Thermophysical Properties of Nickel-coated Aluminum Powder by Electroless Plating
Lee, Sanghyup ; Lim, Jihwan ; Noh, Kwanyoung ; Yoon, Woongsup ;
Journal of the Korean Society of Propulsion Engineers, volume 18, issue 4, 2014, Pages 9~17
DOI : 10.6108/KSPE.2014.18.4.009
In this study, in order to improve the ignitability of high energy aluminum powder, natural oxide films (alumina) were chemically removed, and instead nickel coat was applied. We used an electroless plating for nickel coating and confirmed quantitatively and qualitatively a time-dependent degree of nickel coating through analysis of surface by SEM/EDS. We also conducted element analysis by XRD and thermal properties by TGA/DSC in air oxidizer environment. There results explained the ignition enhancement mechanism of the nickel-coated aluminum powder in air. The difference between coated and un-coated aluminum powder, the effectiveness of coated powder has better ignitability.
An Analysis and Reduction Design of Combustion Instability Generated in Hybrid Rocket Motor
Lee, Jungpyo ; Rhee, Sunjae ; Kim, Jinkon ; Moon, Heejang ;
Journal of the Korean Society of Propulsion Engineers, volume 18, issue 4, 2014, Pages 18~25
DOI : 10.6108/KSPE.2014.18.4.018
In this paper, the mechanism of the combustion instability which may occur in a hybrid rocket motor with a diaphragm was studied. And the new design for a hybrid motor grain was suggested. It could increase a regression rate of solid fuel, and reduce a large pressure oscillation in a hybrid rocket motor with a diaphragm. It was confirmed that the main mechanism of a large pressure oscillation was hole-tone, and it was caused by a collision between a diaphragm and a vortex which was generated in a pre-chamber. And `Stepped Grain` design which had the mechanism for high regression rate in a motor with a diaphragm and could reduce a combustion instability was suggested.
Study on Boron-bead Combustion Characteristics for High Energy Gas Generator
Han, Doo-Hee ; Kang, Jeong-Seok ; Shin, Jun-Su ; Sung, Hong-Gye ; Shin, Kyung-Hoon ; Choi, Sung-Han ; Hwang, Kab-Sung ;
Journal of the Korean Society of Propulsion Engineers, volume 18, issue 4, 2014, Pages 26~32
DOI : 10.6108/KSPE.2014.18.4.026
The combustion characteristics of Boron-beads to improve the energy density of gas generator has been investigated in accordance with diameter of beads and their composition. In this paper, electrically heated tungsten sheet and visualized furnace are applied to measure ignition temperature and burning time of bead respectively. The results proposes ignition temperature between 720~800 K and burning time proportional to bead diameter. Also a ignition delay of boron particle is detected through the temperature and radiation intensity measurements.
A Study on the Flame Shape and the Interaction between Pilot and Main Flames in a Dual Swirl Combustor
Jo, Jun-Ik ; Park, Tae-Joon ; Hwang, Cheol-Hong ; Lee, Kee-Man ;
Journal of the Korean Society of Propulsion Engineers, volume 18, issue 4, 2014, Pages 33~42
DOI : 10.6108/KSPE.2014.18.4.033
Flame behaviors and interaction between pilot and main flames in a dual swirl combustor were investigated experimentally and numerically. Under the condition of fixed swirl angle of
for main flame, the swirl angle of pilot flame, total heat release rate and equivalence ratio of main flame were used as major parameters. As a result, detailed flame stability diagram of dual swirl combustor was identified in terms of 5 flame modes with the changes in total heat release rate and equivalence ratio of main flame. It was found that the swirl angle of pilot flame plays the most important role in the changes in flame location and overall flow structure inside the combustor, and thus leads to the significant change in the interaction between pilot and main flame.
A Schlieren-photographic Visualization of the Methane/Air Premixed Flame Propagating inside a Rectangular Tube Locally-perturbed by an Ultrasonic Standing Wave
Kim, Min Sung ; Kim, Jeong Soo ; Hwang, Yeong Yeun ;
Journal of the Korean Society of Propulsion Engineers, volume 18, issue 4, 2014, Pages 43~49
DOI : 10.6108/KSPE.2014.18.4.043
This experimental study has been conducted to scrutinize the effects of an ultrasonic standing wave (USW) on the propagating velocity and structure of methane/air premixed flame. Propagating flame was caught by high-speed Schlieren photography, and the variation of flame-behavior was analyzed in detail. It is revealed that horizontal splitting in burnt zone is resulted by the USW, and the flame propagation velocity is augmented due to the strengthened chemical reaction. Evolutionary feature of the flame perturbed by USW, maintaining a pseudo-symmetry of top and bottom flame-front about the propagation axis tends to be free from buoyancy effect.
Conceptual Design of An Underwater Vehicle Powered by Water-breathing Ramjet
Um, Jaeryeong ; Lim, Hyunae ; Jin, Wansung ; Choi, Jeong-Yeol ;
Journal of the Korean Society of Propulsion Engineers, volume 18, issue 4, 2014, Pages 50~60
DOI : 10.6108/KSPE.2014.18.4.050
Many countries are paying efforts to the research and development of water-breathing ramjet propulsion for submersible vehicle with the super-cavitation which makes traveling at high speed in underwater possible. In this study, a conceptual design of an underwater vehicle with water-breathing ramjet was carried out. Mission profiles and operating conditions are determined by examining the operation environment. Drag is estimated based on the theories of super-cavitation and fluid mechanics. The sizing and performance analysis of the components were performed using thrust required, thrust and specific impulse of designed engine were verified.
Compression Fracture Behavior of ATJ Graphite for Rocket Nozzle throat
Choi, Hoonseok ; Kim, Jaehoon ; Kim, Yeonwook ; Seo, Bohwi ; Moon, Soonil ;
Journal of the Korean Society of Propulsion Engineers, volume 18, issue 4, 2014, Pages 61~66
DOI : 10.6108/KSPE.2014.18.4.061
Graphite is commonly used for rocket nozzle. The purpose of the present study is to evaluate compression fracture behavior of ATJ graphite. Uniaxial compression test is conducted in accordance with ASTM C 695 in the range of R.T to
. The size effects of specimen on the compressive strength and fracture behavior were investigated. Two types of cylindrical specimen, i.e., where the diameter to length ratio is 1:2 (ASTM C 695 specimen) or 1:1, were tested at room temperature.
Development of Mathematical Model to Predict Specific Wear Rates of Graphite Seal
Kim, Yeonwook ; Kim, Jaehoon ; Park, Sunghan ; Lee, Hwangyu ; Kim, Beomkeun ; Lee, Seongbeom ; Kwak, Jae Su ;
Journal of the Korean Society of Propulsion Engineers, volume 18, issue 4, 2014, Pages 67~73
DOI : 10.6108/KSPE.2014.18.4.067
The dry sliding wear behavior of graphite that is used as the sealing material to cut off hot gas was evaluated as a function of applied load, sliding speed and temperature. The reciprocating wear tests were carried out at room temperature and elevated temperatures. An attempt has been made to develop a mathematical model by response surface methodology and an analysis of variance technique was applied to confirm the validity of the developed model. Also, the wear mechanism was compared through the observation of the worn surface by SEM analysis.
A Study on Development of the Dual-thrust Flight Motor for Enhancing the Hit Probability
Kim, Hanjun ; Kim, Eunmi ; Kim, Namsik ; Lee, Wonbok ; Yang, Youngjun ;
Journal of the Korean Society of Propulsion Engineers, volume 18, issue 4, 2014, Pages 74~80
DOI : 10.6108/KSPE.2014.18.4.074
This paper describes the development of the dual-thrust flight motor for enhancing the hit probability of unguided rockets. We designed dual-thrust flight motor by shape modification of the double base propellant with high burning rate, and confirmed the dual-thrust performance by static firing tests. The test results showed the thrust ratio of about 1:7.6 between sustaining phase and boosting phase, and had a quietly normal dual-thrust characteristics. And the results showed that there was not the fire extinction phenomenon of propellant due to the pressure drop.
1-D Analysis of Tandem-ejector for the Engine-bay Ventilation
Im, Ju Hyun ; Kim, Myung Ho ; Kim, Yeong Ryeon ; Jun, Sang In ;
Journal of the Korean Society of Propulsion Engineers, volume 18, issue 4, 2014, Pages 81~89
DOI : 10.6108/KSPE.2014.18.4.081
Tandem-ejector has been devised for engine-bay cooling. In this study, 1-D model has been developed to analyze Tandem-ejector. In the model, the primary, the secondary and the tertiary flow conditions have been analyzed with isentropic process. The mixing process has been analyzed with conservation laws based on the control volume analysis. The total pressure loss of the primary flow has been analyzed under the matching condition between the static pressure of Tandem-ejector discharge flow and atmospheric pressure. Consequently, 1-D model can predict Tandem-ejector performance accurately and provide the performance map.