TPSAS-NF1676L-31885-DND
What we will cover: - Visualization overview ( &sampling_parameters ) - Component force and moment tracking ( &component_parameters ).
Jan Carlson↗
Engineering topics
Jan Carlson
Publications and source records attributed to Jan Carlson.
Setting Boundary Conditions For Slotted Throat Wind Tunnels Using Calorically Imperfect Gas Assumptions
Explore the source record for details and available documents.
Ground testing↗
Assessment of Using Ideal Gas for Predicting Boattail Flow at Cryogenic Temperatures
The applicability of using ideal gas assumptions to simulate high Reynolds number experimental data that was obtained at cryogenic temperatures is examined. Flow over an axisymmetric nozzle boattail model was calculated using reference temperatures of 117 K and 300 K and at Reynolds numbers from 50 to 200 million per meter. From the testing perspective, pressure, compression factor, and isentropic coefficients calculated using one-dimensional real gas equations are used to examine the departure of cryogenic flow from ideal gas flow across the range of temperatures and potential impacts on measured aerodynamic data. Solutions developed using ideal gas assumptions in a three-dimensional Navier-Stokes code are compared with experimental data obtained at cryogenic temperatures at two unit Reynolds numbers at freestream Mach numbers of 0.6 and 0.9. Results for several one- and two-equation turbulence models are shown. Predicted pressure coefficient distributions along the nozzle boattail differed from experimental data between 8% to less than 0.5% depending on the turbulence model and Mach number. The greatest discrepancy occurred in the level of static pressure recovery in the recompression region where the flow was separated. Solutions using warm and cryogenic freestream temperatures predicted similar boattail pressure distributions at the same unit Reynolds number.
Nozzle↗