Damljanovi military technical institute, belgrade, serbia. A wind tunnel that is closed and recirculates the air through the test section is called a closed return tunnel. Two methods to experimentally investigate supersonic ground effect problems in a wind tunnel have been examined to determine their relative effectiveness compared to a more realistic, but physically unfeasible, representation of the ground effect by means of a moving ground. Isbn 9789533072951, pdf isbn 9789535159773, published 20110210.
In this paper, the design and application of a flc is discussed to control the plenum chamber temperature for a blowdown supersonic wind tunnel bswt with the aim of achieving the accurate and desired results. The application of fuzzy logic controllers flcs to the control of nonlinear processes, typically controlled by a human operator, is a topic of much study. May 05, 2015 on the figure, we show a schematic drawing of a blowdown wind tunnel. Design and evaluation of a windtunnel with expanding corners 3 l2000, was built in 1963 and is still used for aeronautical research. This page contains several timelines that trace events that impacted the awt and spc, tests conducted at the facility, and the development of wind tunnels and vacuum chambers. The university of texas at arlington has developed a subscale blowdown wind tunnel for aeropropulsion experiments fig. Computer aided design cad file be used for aluminum model design and fabrication is used for rp model. The air is heated to a maximum temperature of approximately 1100r by an electrical resistance heater. Pdf a computerbased, proportionalintegral control system for supersonic blowdown wind.
In this section of the website we shall present various types of wind tunnels and discuss some of the unique features of each type of tunnel. Although great advances in computational methods have been made in recent years, wind tunnel tests remain essential for obtaining the full range of data required to guide detailed design decisions for various practical engineering problems. Minimum operating reynolds numbers were adequate for these. Most of the time, large powerful fans blow air through the tube. Enhancing the supersonic wind tunnel performance based on. The design of wind tunnel components, as well as their stress analysis, was conducted using solidworks.
Windtunnel development of an sr71 aerospike rocket. During a supersonic run of a blowdown wind tunnel, temperature of air in the. For most open circuit tunnels, fan assemblies are located downstream of the test section and air is drawn through the wind tunnel with suction. Designing an induction wind tunnel university of twente student.
Some problems in design and operation of blowdown wind. Wind tunnels of the eastern hemisphere library of congress. The ejectors are run from the same supply as the tunnel itself, but because they are only used at low reynolds numbers when the cascade mass flow is small. A supersonic windtunnel consists of a nozzle block, testsection and a diffuser. Design and simulation of open circuit blowdown type wind. Advanced flow control for supersonic blowdown wind tunnel. I will include some basic illustrations, photographic details, supplier information and the recommendations that i would consider if i. Figure 2 shows a schematic of a typical supersonic blowdown wind tunnel with all of the. In the present paper an open circuit blow down type wind. Design and construction of a supersonic wind tunnel worcester.
Altitude wind tunnel timelines glenn research center nasa. The test section sits at the end of a supersonic nozzle. Blowdown tunnels are normally used from high subsonic to high supersonic flow conditions. The hypersonic tunnel facility htf at nasas plum brook station located in sandusky, oh, originally designed to test nuclear thermal rocket nozzles, is a hypersonic mach 5, 6, and 7 blowdown, nonvitiated freejet facility that tests largescale hypersonic airbreathing propulsion systems. The wind loads provided by wind engineering specialists have a major e. A study of pressure control for a blowdown wind tunnel core. A blowdown wind tunnel has a high pressure vessel upstream of the test section and a low. Pdf development and performance investigation of supersonic. Please read our short guide how to send a book to kindle. Wind tunnels langley 20inch mach 6 tunnel the 20inch mach 6 tunnel is a blowdown wind tunnel that uses dry air as the test gas. Highspeed internal flows are complex and are often associated with shockwaveboundarylayer interactions.
Design of a blowdown supersonic wind tunnel clark, raymond. Windtunnel development of an sr71 aerospike rocket flight. A wind tunnel in which stored compressed gas is allowed to expand through a test section to provide a stream of gas or air for model testing. Since tap 0 is the only tap connected to the wind tunnel, readings from tap 0. Blowdown tunnel article about blowdown tunnel by the. The nasa langley 8foot high temperature tunnel is a combustionheated hypersonic blowdown toatmosphere wind tunnel that provides flight enthalpy simulation.
There are several possible configurations for a blowdown tunnel. The control strategy is designed based on the state estimation of a real blowdown wind tunnel, which is carried out under an ekf structure. The object can be a small model of a vehicle, or it can be just any part of a. On the figure, we show a schematic drawing of a blowdown wind tunnel. Compressed air is injected into the back end of the tunnel by a. Aerolab offers variable mach number supersonic wind tunnels in test section sizes from 1inch x 1inch 2. The tunnel in the upper left of the figure is a closed return tunnel. Although great advances in computational methods have been made in recent years, wind tunnel tests remain essential for obtaining the full range of data required to guide detailed design decisions for various practical engineering. A tandem ejector pumping system has been applied to an intermittent blowdown tunnel for cascade testing to achieve subatmospheric exit pressures and extend the operating range substantially. Hypersonic tunnel facility glenn research center nasa. Hypersonic wind tunnel hwt also a blowdown wind tunnel run times typically 45 seconds with 45 minute turnaround blows down to vacuum mach 5, 8, and 14 using different test sections 18 diameter test section testing similar to twt. Adapting a blowdown type wind tunnel for ground effect. For blowdown wind tunnels, however, air is blown down into the wind tunnel by a fan or centrifugal blower. A study of pressure control for a blowdown wind tunnel by f.
Windtunnel facilities two windtunnel facilities were used to test the lasre con. The reference dimensions for this configuration are as follows. The tunnel at the lower right of the figure is an open return tunnel. Publication date 195005 topics aeronautics publisher. A supersonic, a hypersonic and a ballistic wind tunnel are also part of the early aeronautical research history at kth. This book collects original and innovative research studies on recent applications in wind tunnel tests, exhibiting various investigation directions and. Blowdown tunnel definition is an intermittent wind tunnel in which the air flow is produced by rapid discharge of a highpressure storage tank or by suction from an evacuated reservoir. Blowdown tunnel article about blowdown tunnel by the free. The oil dot surface flow viz technique was used in the fullscale facility to visualize the flow field. Transonic closed circuit, continuous flow wind tunnel.
Blow down wind tunnels aerolab low turbulent wind tunnel. Types of wind tunnel closedtype opentype blowdown shock tube. Prediction of total pressure characteristics in the. Design of a blowdown supersonic wind tunnel clark, raymond l download bok. Design and simulation of open circuit blowdown type wind tunnel. Pdf supersonic blowdown wind tunnel control using labviewtm. The nasa langley 8foot high temperature tunnel is a combustionheated hypersonic blowdowntoatmosphere wind tunnel that provides flight enthalpy simulation. A supersonic, a hypersonic and a ballistic windtunnel are also part of the early aeronautical research history at kth. This catalog is a compilation of data on subsonic, supersonic, and hypersonic wind tunnels in the eastern hemisphere used for.
The performance of this supersonic blowdown wind tunnel is analyzed theoretically and experimentally. Blowdown wind tunnels are a special type of open circuit wind tunnel. Experimental data were compared with the results of numerical simulations. Stagnation temperature control in blowdown wind tunnels. The use of tandem ejector pumps in an intermittent blowdown. Details on the various aspects of the supersonic windtunnel and its components can be found in the text by anderson 1,2. One of the distinctive advantages of the proposed approach is its adaptability to a wide range of operating conditions for blowdown wind tunnels. These corrections generally fall into two categories. Based on these considerations, it was decided to design and fabricate a supersonic wind tunnel with a reasonable run time of 30 seconds, using the pressure vessel available in the laboratory. In other types of blowdown wind tunnels, the low pressure chamber is removed.
Pressure measurement in a blowdown wind tunnel sciencedirect. On the figure, we show completely closed supersonic configuration. Blowdown tunnel definition of blowdown tunnel by merriam. Windtunnel article about windtunnel by the free dictionary. The wind tunnel moves air around an object, making it seem as if the object is really flying. Utility boilers, operating below 5000 kpa often use sodium zeolite andor hot or cold lime softening, in which case the continuous blowdown will be in constant operation, and the intermittent blowdown will be performed once per day.
Design of a blowdown supersonic wind tunnel clark, raymond l. A fixed geometry, twodimensional contoured nozzle with parallel. Wind tunnel inroduction wind tunnel gas technologies. The object being tested is held securely inside the tunnel so that it remains stationary and does not move. I will include some basic illustrations, photographic details, supplier information and the recommendations that i would consider if i decide to construct another wind tunnel. A wind tunnel simulates the conditions of an aircraft in flight by causing a highspeed stream of air to flow past a model of the aircraft or part of an aircraft being tested. May 05, 2015 the tunnel at the lower right of the figure is an open return tunnel. It is mostly used to study flow patterns around bodies and measure aerodynamic forces on them. A supersonic wind tunnel is a wind tunnel that produces supersonic speeds 1. Prediction of total pressure characteristics in the settling chamber of a supersonic blowdown wind tunnel volume 115 issue 1171 g. It has a 3 m long test section of 2 2 m2 cross section and a maximum speed of 62 ms. A study of pressure control for a blowdown wind tunnel. A design method is presented for limiting the variation of stagnation temperature in a blowdown wind tunnel so that the resultant reynolds number variation of. Design and evaluation of a lowspeed windtunnel with.
Altitude wind tunnel timelines nasa lewis researchers go over the atlascentaur test setup with general dynamics technicians inside spc no. Library of congress federal research division aeronautical wind tunnels eastern hemisphere. Stagnation pressure transient control in a supersonic blowdown. Design and simulation of open circuit blowdown type wind tunnel conference paper pdf available december 2012 with 2,010 reads how we measure reads.
Open the saved file and check the pressures and velocities. A suction type continuous operation supersonic up to mach 1. A study of pressure control for a blowdown wind tunnel by kanaga, f. Jun 11, 2008 two methods to experimentally investigate supersonic ground effect problems in a wind tunnel have been examined to determine their relative effectiveness compared to a more realistic, but physically unfeasible, representation of the ground effect by means of a moving ground. 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. For students, wind tunnel experience with shock and expansion waves makes an excellent addition to theoretical studies. Philpott the hatfield polytechnic school of engineering, po box 109, hatfield, herts all0 9ab, england an automatic system for steady pressure measurement in a small handcontrolled supersonic wind tunnel is described. Production of wind tunnel testing models with use of rapid. Methods for investigating supersonic ground effect in a. Design and evaluation of a wind tunnel with expanding corners 3 l2000, was built in 1963 and is still used for aeronautical research. The use of tandem ejector pumps in an intermittent.
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