Download or read book A Comparative Analysis of Convective Heat Transfer in a Nuclear Rocket Nozzle written by Harvey E. Neumann and published by . This book was released on 1963 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Heat transfer Effects in Rocket Nozzles Operating with Very High temperature Hydrogen written by John R. Howell and published by . This book was released on 1965 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analytical technique suitable for & the solution of complex energy transfer problems involving coupled radiant and convective energy transfer is developed. Solutions for the coupled axial wall energy flax distribution in rocket nozzles using hydrogen as a propellant are presented. Flow rates and temperatures studied are near those forecast for gaseous-core nuclear-propulsion systems. Parameters varied are nozzle shape, inlet propellant temperature, mean reactor cavity temperature, and nozzle wall temperature level. The effects of variation of the propellant radiation absorption coefficient with pressure, temperature, and wavelength are presented, and real property variations are used where they appear to be significant. Comparison is made to a simplified, coupled solution using a modified second-order one-dimensional diffusion equation for the radiative transfer. At the temperature levels assumed, radiative transfer may account for a greater portion of the total energy transfer over important portions of the nozzle, and its effects cannot, therefore, be neglected. Extreme energy flaxes (near 3XlO to the 8 Btu/(hr)(sq ft)) are observed for certain cases, and this implies that new nozzle cooling techniques must be developed.
Download or read book Analysis Feasibility and Wall temperature Distribution of a Radiation cooled Nuclear rocket Nozzle written by William H. Robbins and published by . This book was released on 1962 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comparison of Predicted Nozzle Coolant Side Heat Transfer and Fluid Flow with Experimental Values from Phoebus 2A Nuclear Tests written by Maynard F. Taylor and published by . This book was released on 1969 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Heat transfer Effects in Rocket Nozzles Operating with Very High temperature Hydrogen written by John R. Howell and published by . This book was released on 1965 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analytical technique suitable for& the solution of complex energy transfer problems involving coupled radiant and convective energy transfer is developed. Solutions for the coupled axial wall energy flax distribution in rocket nozzles using hydrogen as a propellant are presented. Flow rates and temperatures studied are near those forecast for gaseous-core nuclear-propulsion systems. Parameters varied are nozzle shape, inlet propellant temperature, mean reactor cavity temperature, and nozzle wall temperature level. The effects of variation of the propellant radiation absorption coefficient with pressure, temperature, and wavelength are presented, and real property variations are used where they appear to be significant. Comparison is made to a simplified, coupled solution using a modified second-order one-dimensional diffusion equation for the radiative transfer. At the temperature levels assumed, radiative transfer may account for a greater portion of the total energy transfer over important portions of the nozzle, and its effects cannot, therefore, be neglected. Extreme energy flaxes (near 3XlO to the 8 Btu/(hr)(sq ft)) are observed for certain cases, and this implies that new nozzle cooling techniques must be developed.
Download or read book NASA Technical Note written by and published by . This book was released on 1966 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comparative Studies of Convective Heat Transfer Models for Rocket Engines written by J. C. DeLise and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Analysis of Nuclear rocket Nozzle Cooling written by William H. Robbins and published by . This book was released on 1960 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: A nuclear-rocket regenerative-cooling analysis was conducted over a range of reactor power of 46 to 1600 megawatts and is summarized herein. Although the propellant (hydrogen) is characterized by a large heat-sink capacity, an analysis of the local heat-flux capability of the coolant at the nozzle throat indicated that, for conventional values of system pressure drop, the cooling capability was inadequate to maintain a selected wall temperature of 1440 R. Several techniques for improving the cooling capability were discussed, for example, high pressure drop, high wall temperature, refractory wall coatings, thin highly conductive walls, and film cooling. In any specific design a combination of methods will probably be utilized to achieve successful cooling.
Download or read book NASA Technical Note written by and published by . This book was released on 1963 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Analysis of Thermal Radiation Heat Transfer in a Nuclear rocket Nozzle written by William H. Robbins and published by . This book was released on 1961 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Feasibility of Optimizing Nozzle Performance for Orbital launch Nuclear Rockets written by John R. Jack and published by . This book was released on 1963 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Report written by and published by . This book was released on 1965 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis Feasibility and Wall temperature Distribution of a Radiation cooled Nuclear rocket Nozzle written by William H. Robbins and published by . This book was released on 1961 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analysis was made to determine the feasibility of operating radiation-cooled nuclear-rocket nozzles with hydrogen as the propellant. Walltemperature distributions and heat fluxes along the nozzle were calculated by two techniques. One wall-temperature distribution was obtained from a simplified heat balance which included only the convection into the wall and the radiation from the wall. A more refined calculation was made for wall temperature in which the heat balance also included the radiation inside the nozzle and the axial and radial heat conduction. The agreement between the two solutions of temperature distribution was excellent in the divergent portion of the nozzle. The average temperature difference over the range of pressure and area ratio investigated was approximately 1 percent. In the convergent section large differences in temperature between the two solutions were observed, because the radiant heat flux from the reactor to the nozzle was neglected in the simplified solution. (Author).
Download or read book Turbulence Heat transfer and Boundary Layer Measurements in a Conical Nozzle with a Controlled Inlet Velocity Profile written by Donald R. Boldman and published by . This book was released on 1966 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Use of Energy Thickness in Prediction of Throat Heat Transfer in Rocket Nozzles written by Robert W. Graham and published by . This book was released on 1969 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Energy thickness in prediction of throat heat transfer in rocket nozzles using nozzle geometries and temperature ratios.
Download or read book Variation of Convective Heat transfer Coefficient Around a Simulated Rocket Cooling Tube Section written by Ronald G. Huff and published by . This book was released on 1969 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Prediction of Local and Integrated Heat Transfer in Nozzles Using an Integral Turbulent Boundary Layer written by Donald R. Boldman and published by . This book was released on 1972 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: An empirical modification of an existing integral energy turbulent boundary layer method is proposed in order to improve the estimates of local heat transfer in converging-diverging nozzles and consequently, provide better assessments of the total or integrated heat transfer. The method involves the use of a modified momentum-heat analogy which includes an acceleration term comprising the nozzle geometry and free stream velocity. The original and modified theories are applied to heat transfer data from previous studies which used heated air in 30 deg - 15 deg, 45 deg - 15 deg, and 60 deg - 15 deg water-cooled nozzles.
