graphite rocket nozzle erosion rate reduction by

Densification Behavior of Rhenium Alloy for Non

In general, graphite and carbon-carbon composites have been widely used as nozzle materials to reduce the erosion rate of throat-area. However, the erosion rate of those materials is not enough to maintain propulsion. In this regard, there have tried to employ

Effect of Surface Roughness and Radiation on Graphite Nozzle

Technical Notes Effect of Surface Roughness and Radiation on Graphite Nozzle Erosion in Solid Rocket Motors Piyush Thakre∗ CD-adapco, Ltd., Melville, New York 11747 and Vigor Yang† Georgia Institute of Technology, Atlanta, Georgia 30332-0150 DOI: 10.2514

PERFORMANCE EVALUATION OF FLEX NOZZLE ABLATIVE LINERS BY CONDUCTING SOLID ROCKET

enhanced the performance of the flex nozzle sys Fig. 6 Contribution of erosion, char profile of nozzle liners Table 2 Erosion rate measured after ground firing test Fig. 7 Erosion rates measured after ground firing test of nozzle 3. Conclusions A solid

Reconstruction Techniques for Evaluating Fuel Mass Consumption and Nozzle Throat Erosion in Hybrid Rockets

rocket static firing test data to simultaneously estimate multiple key performance parameters: such as mixture ratio history, nozzle throat erosion history, and fuel surface regression rate history. This is done by combining principles from ideal nozzle

SOLID SOLUTION CARBIDES ARE THE KEY FUELS FOR FUTURE NUCLEAR THERMAL PROPULSION

This erosion also removed fuel particles embedded in the graphite matrix. During the Rover/NERVA program, as many as 27 rocket engine tests were carried out from 1959 to 1972, allowing new designs to be carried out and advanced fuels

Improving Performance of Solid Rocket Fuel through

The manufacturing materials of the nozzle assembly must be able to withstand temperatures of combustion gasses on the order of 3000 K, high-radiative heat fluxes (greater than 10 MW/m2 [Ref 8]) caused by intense emissions of light, erosion, stress, thermal

Graphite Rocket Nozzles

This versatile and economical inspection is highly valued for in-process inspection of graphite rocket nozzle components and can be a valuable tool when applied to other close tolerance graphite products, where reduction or detection of cracks and maintenance of

Effect of Chamber Pressure Propellant Composition

1 Technical Paper Graphite Rocket Nozzle Erosion Rate Reduction by Boundary-Layer Control Using Ablative Materials R. Acharya, K. Kuo American Institute of Aeronautics and Astronautics 7 Technical Paper Simulation of Nozzle Erosion Process in a Solid

The Design, Manufacture and Test of a Liquid Propellant Aerospike Rocket Engine

graphite was employed for the nozzle because of its resistance to extreme temperatures and comparably low erosion rate. Since any significant amount of erosion would change the area of the throat, film cooling was employed as mentioned earlier. The contour

Effects of CVD Carbon on the Erosion Behavior of 5D

A comprehensive model to predict and mitigate the erosion of carbon-carbon/graphite rocket nozzles. 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit. 2007–5777 14. Acharya, R., Kuo, K.K.: Effect of pressure and propellant composition on graphite rocket nozzle erosion rate.

Numerical Simulation of Flow inside a Solid Rocket Motor by Eulerian

nozzle exit is in good agreement with the common trend of samples taken from the static firing test. Keywords: solid rocket motor, multiphase flow, nozzle erosion, Eulerian-Hybrid method Introduction A solid-propellant rocket motor (SRM) that was about

Densification Behavior of Rhenium Alloy for Non

In general, graphite and carbon-carbon composites have been widely used as nozzle materials to reduce the erosion rate of throat-area. However, the erosion rate of those materials is not enough to maintain propulsion. In this regard, there have tried to employ

Rocket engine nozzle

A rocket engine nozzle is a propelling nozzle (usually of the de Laval type) used in a rocket engine to expand and accelerate the combustion gases produced by burning propellants so that the exhaust gases exit the nozzle at hypersonic velocities. Simply: the rocket (pumps and a combustion chamber) generates high pressure, a few hundred

Microstructural and ablative properties of graphite

2020/1/27The successful protection of the graphite nozzle using a CVD-SiC coating is evident. Firstly, none of the coated samples showed an increase in throat diameter, when comparing the results presented in figures 4 and 5. A substantial reduction in weight loss is

The Design, Manufacture and Test of a Liquid Propellant Aerospike Rocket Engine

graphite was employed for the nozzle because of its resistance to extreme temperatures and comparably low erosion rate. Since any significant amount of erosion would change the area of the throat, film cooling was employed as mentioned earlier. The contour

Nanoscale Prediction of Graphite Surface Erosion by Highly Energetic Gas

Surface Erosion, Rocket Nozzle, Highly Energetic Gas, Molecular Dynamic Simulation 1. Introduction Graphene is a one-atom thick planar sheet of sp 2-bonded carbon atoms, which has attracted the attentions of many researchers for its novel electrical and

Numerical Simulation of Flow inside a Solid Rocket Motor by Eulerian

nozzle exit is in good agreement with the common trend of samples taken from the static firing test. Keywords: solid rocket motor, multiphase flow, nozzle erosion, Eulerian-Hybrid method Introduction A solid-propellant rocket motor (SRM) that was about

Castable rocket nozzle compositions

Castable rocket nozzle compositions - posted in Pyrotechnic Formula: I have recently decided to try some rocket designs, but have been faced with the problem of a pourable nozzle substance. I regularly work with high-power experiental rocket motors, but the nozzle designs I use are graphite and/or a very hard grade of phenolic which is black. These sorts of nozzles are not efficient obviously

Graphite Rocket Nozzle Erosion Rate Reduction by

Graphite Rocket Nozzle Erosion Rate Reduction by Boundary-Layer Control Using Ablative Materials Ragini Acharya and Kenneth Kuo Ragini Acharya Dept. of Mechanical and Nuclear Engineering, The Pennsylvania State Univ. Search for more papers by this

NUMERICAL INVESTIGATION OF NOZZLE THERMOCHEMICAL BEHAVIOUR IN HYBRID ROCKET

ABSTRACT Solid and hybrid rocket motor nozzles are protected from the high enthalpy gasses using particular kind of materials that absorb the transferred thermal energy by changing their chemical state. This turns into a recession of nozzle surface called erosion.

Numerical Simulation of Missile Jet Deflector

graphite liners. Bianchi et al. [19] presented a thermochemical erosion analysis for graphite/carbon–carbon rocket nozzle consid-ering the solution of the RANS equation in the nozzle, the heterogeneous chemical reaction at the nozzle surface, and heat

Graphite Nozzle Performance Investigations with High Power Arcjets

IEPC-97-085 526 25th International Electric Propulsion Conference, August 24-28, 1997, Cleveland, Ohio Graphite Nozzle Performance Investigations with High Power Arcjets Martin Riehle, Helmut L. Kurtz, Frank Hammer and Monika Auweter-Kurt

14th Workshop on Two

• Mechanical erosion is prevalent only in the convergent section of the rocket nozzle State of the art Thakre. 2008. Chemical erosion of graphite and refractory metal nozzles and its migation in solid-propellant rocket motor. Thesis Thakre et al. 2013. Journal of

:Experimental investigation of the

One of the issues of using a normal graphite nozzle for the hybrid rocket propulsion is the serious throat erosion due to combustion with a higher O/F ratio. This may undermine the throttling capability of the hybrid rocket engine. In this study, we would like to

Nozzle Mixes

Nozzle Mixes - posted in Rocketry: I'm just starting to get into making rockets. I like the attention they get when they are used to lift a shell. I am getting my motors dialed in, and am about to start building what I'll need. I've read that straight clay nozzles expand/contract with humidity, and are not recommended (By some) for rockets that will not be used for a period of time. Because of

Richard Nakka's Experimental Rocketry Site

After three firings, the nozzle showed zero throat erosion, so the capability of 12L14 steel to stand up to the heat of combustion has been confirmed. An alternate non-metal material that is especially suitable is graphite, although the use of this material requires special considerations, due to the copious amount of messy and electrically conductive dust that is generated.

Landon Thomas Kamps (Faculty of Engineering Mechanical

The rocket is faced with the problem of erosion of graphite nozzle. Nozzle erosion, which is mainly caused by oxidation reaction, decreases specific impulse of rockets. The authors selected some materials which can prevent nozzle erosion and evaluated anti-erosion materials for hybrid rocket nozzle by combustion experiments.

14th Workshop on Two

• Mechanical erosion is prevalent only in the convergent section of the rocket nozzle State of the art Thakre. 2008. Chemical erosion of graphite and refractory metal nozzles and its migation in solid-propellant rocket motor. Thesis Thakre et al. 2013. Journal of

FEASIBILITY DEMONSTRATION OF PYROLYTIC GRAPHITE COATED NOZZLES

in nozzle service with propellant having flame temperatures from 56000F to 6550*F. The higher the flame temperature and the motor operating pressure the higher the erosion rate observed for pyrolytic graphite. Specifically, 1/2-inch diameter nozzleso rates of

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