Results 51 to 60 of about 116 (92)

Monitoring of Sulfur Mustard (HD) Vapor in the Presence of Absorptive Building Materials. [PDF]

ACS Omega
Oudejans L, See D.
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Pressure-Sensitive Paint Measurements in a Blowdown Wind Tunnel

Journal of Aircraft, 2005
A methodology to correct for temperature effects on pressure-sensitive paint data in a blowdown wind tunnel has been suggested. PSP measurements using Optrod-B1 paint were made on an aircraft model instrumented with thermocouples and conventional pressure taps.
P R Viswanath
exaly   +2 more sources

Supersonic Blowdown Wind Tunnel Control Using LabVIEW

46th AIAA Aerospace Sciences Meeting and Exhibit, 2008
A computer-based, proportional-integral control system for supersonic blowdown wind tunnels was developed in a LabVIEW environment. The control algorithm is based on numerically integrating the differential equations used to model a supersonic blowdown wind tunnel in which the proportional and integral control terms were added and tuned in a simulation
Frank Lu
exaly   +2 more sources

Basic Experiments on a Cryogenic Wind Tunnel of Flashing-Blowdown Type

Advances in Cryogenic Engineering, 1996
This paper deals with the experimental approach to a new concept of cryogenic wind tunnel of short duration. In the last two decades various closed-cycle and continuous operation (CCCO) cryogenic wind tunnels have been developed and they have shown many advantages for high Reynolds number experiments.
Maeno K
exaly   +2 more sources

Stagnation Pressure Transient Control in a Supersonic Blowdown Wind Tunnel Test Facility

Materials Today: Proceedings, 2016
Abstract Research in the area of wind tunnel flow parameters control has been intensified in recent years, in an attempt to improve quality and efficiency of the wind tunnel operation. In this paper, stagnation pressure transient control in a supersonic blowdown-type wind tunnel is considered, with the aim of increasing available measurement time and
Biljana Ilić, Jovan Isakovic
exaly   +3 more sources

Diagnostic simulation of a pneumatically controlled blowdown wind tunnel

Simulation, 1973
The nonlinear differential equations required to correctly model the plenum pressure history of a pneumatically controlled blowdown wind tunnel are derived,and arguments in favor of digital simulation of the full nonlinear equations as opposed to conven tional linearized analysis are presented.
exaly   +2 more sources

Cascade nonlinear feedforward-feedback control of stagnation pressure in a supersonic blowdown wind tunnel

Measurement: Journal of the International Measurement Confederation, 2017
Abstract Current trends in the development of control systems involve disproportionately high costs for embedded software integration and testing techniques that rely almost exclusively on exhaustive testing of more or less complete versions of complex systems. Wind tunnel control systems are not an exception. A formal methodology for supersonic flow
Biljana Ilić, Jovan Isakovic
exaly   +3 more sources

Advanced Flow Control for Supersonic Blowdown Wind Tunnel Using Extended Kalman Filter

Journal of Dynamic Systems, Measurement, and Control, 2013
Supersonic blowdown wind tunnels provide controlled test environments for aerodynamic research on scaled models. During the experiments, the stagnation pressure in the test section is required to remain constant. Due to nonlinearity and distributed characteristics of the controlled system, a robust controller with effective flow control algorithms is ...
Li Mian
exaly   +2 more sources

Model sting support with hard metal core for measurement in the blowdown pressurized wind tunnel

Measurement: Journal of the International Measurement Confederation, 2016
Abstract The wind tunnel model, balance and sting are exposed to the large transient load in the blowdown wind tunnels. As part of the research, in order to improve wind tunnel testing, a new high stiffness sting for testing in the T-38 wind tunnel is developed.
Dušan Ćurčić, Marija Samardžić, Dragan Marinkovski, Zoran Rajić, Zoran Anastasijević   +4 more
exaly   +2 more sources

Flow Quality Improvements in a Blowdown Wind Tunnel

Journal of Aircraft, 2001
Rajan Kumar
exaly   +2 more sources