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Numerical investigation of the axial compressor ...

Numerical investigation of compressor with inlet distortion. Acta Aeronaut Astronaut Sin 2012; 33: 1624 – 1632. Google Scholar: 22. Moore, RD, Reid, L. Performance of single-stage axial-flow transonic compressor with Rotor and Stator aspect ratios of 1.19 and …

RAD221 Midterm Flashcards | Quizlet

13.A radiograph of an AP axial projection of the cervical spine demonstrates a distorted view of the vertebral bodies. The following factors were used during the initial exposure: 40-inch (100-cm) SID, 15° to 20° caudad CR angle, suspended respiration, CR centered to C4. The distortion is most likely due to incorrect: a. SID b. CR angle c. CR ...

Image-based correction of continuous and discontinuous non ...

Since distortion free volumes do not exist, we had to first correct the original image volume using the same non-planar axial distortion correction method. The resulting series, from the perspective of our method, is free of distortions.

Chapter 8 Self-test Flashcards | Quizlet

Situation: A radiograph of the Teufel method (PA axial oblique) demonstrates distortion of the acetabulum. During positioning, the patient was rotated 35º to 40º toward the affected side and CR was angle 20º cephalad. What modifications are needed during the repeat exposure?

OSA | Modeling axial irradiance distortion in holographic ...

Optical needles produced by means of diffractive technology might display limited quality and uniformity. It has been suggested that the bulky optical elements present on these setups can be responsible of such behavior. In particular, issues such as the lack of flatness of the optical components, modulation errors in the holographic displays, and optical aberrations might degrade the quality ...

Inlet Distortion Effects in Axial Compressors | Journal of ...

Aircraft gas turbines are particularly prone to inlet distortion problems due to changes in aircraft attitude and the effect of the airframe on the inlet flow conditions, but industrial insallations may also suffer from inlet distortion in cases where poorly designed bends have been installed upstream of the compressor.

Axial Deformation | Strength of Materials Review

Axial Deformation. In the linear portion of the stress-strain diagram, the tress is proportional to strain and is given by ... To use this formula, the load must be axial, the bar must have a uniform cross-sectional area, and the stress must not exceed the proportional limit. ...

NAVAL POSTGRADUATE SCHOOL - apps.dtic.mil

new approach to defining inlet distortion factors for axial-flow compressors is presented. A summary of past analyses of inlet distortion, along with a brief review of flow-distortion definition and compressor performance, provides a background for the proposed theory, Inlet flow-distortion in terms

Effect of Inlet Distortion on the Performance of an Axial ...

Effect of Inlet Distortion on the Performance of an Axial Cascade Dr. Basharat Salim Associate Professor King Saud University, Riyadh 11421, Riyadh, Saudi Arab [email protected] Abstract--A cascade is defined as an infinite row of equidis-tant similarly aerofoil bodies. The cascade is used to divert a flow stream with a minimal loss.

axial distortion - schroder-stoffen.nl

Axial distortion as a sensor of supercoil changes: a, Negative supercoiling stimulates transcription of many gen In contrast, transcription of the genes coding for DNA gyrase is subject to a novel mechanism of autoregulation, wherein relaxation of the template DNA stimulates their transcription Since DNA gyrase is the sole supercoiling ...

Chromatic aberration - Wikipedia

In optics, chromatic aberration (abbreviated CA; also called chromatic distortion and spherochromatism) is a failure of a lens to focus all colors to the same point. It is caused by dispersion: the refractive index of the lens elements varies with the wavelength of light.The refractive index of most transparent materials decreases with increasing wavelength.

Stall Inception Mechanism in an Axial Flow Fan Under Clean ...

Some preliminary flow characteristics were studied using a seven hole probe. A significant increase in flow angle and decrease in axial flow coefficient close to the rotor tip were observed under co-rotating inflow distortion as compared with counter-rotating inflow distortion.

Optimization of Process Parameters for the Axial ...

Quenching distortion is inevitable during the process, and it has direct effects on the precision of the gear. For spiral bevel gear with big diameter and small thickness, die quenching process is applied in the manufacturing to control the distortion in axial direction.

Axial-flow compressor analysis under distorted phenomena ...

Sep 25, 2018· To know the axial-flow compressor distortion effect, this paper makes an effort to identify the possible effects of distortion under transonic flow conditions. Distortion effect is categorized by two subsections. The first subsection of distortion effect is finding the blockage between rotors to …

Experimental Investigation of Inlet Distortion in a ...

Experimental Investigation of Inlet Distortion in a Multistage Axial Compressor. Razvan Rusu, Purdue University. Abstract. The primary objective of this research is to present results and methodologies used to study total pressure inlet distortion in a multi-stage axial compressor environment.

Local axial distortion of paramagnetic impurity center in ...

The sign of distortion is, as suggested by the above trend, different from that (P~5 -0.07[19]) in the host ZnSiF6-6H20 crystal, but in agreement Vol. 94, No. 4 AXIAL DISTORTION OF PARAMAGNETIC IMPURITY CENTER 319 with the value (,z:~ 0.35[19]) in the isomorphous NiSiF6-6H2O crystal.

Dynamic Axial Brain Stem Distortion as a Mechanism in the ...

: Dynamic axial distortion of the brain stem has long been recognized as occurring in the presence of supratentorial mass lesions. Although brain stem hemorrhages occur under these circumstances, the pathophysiology of these hemorrhages is still a matter of controversy. In the present study, the ...

Axial (longitudinal) aberration? - Cambridge in Colour

Jul 27, 2017· Re: Axial (longitudinal) aberration? Ed - from an academic standpoint, I find the different approaches that lens designers use to create a specific lens design quite interesting, but as an end user, the simple answer tends to be that all lenses are designed to hit a certain price point that the marketing groups hit sales and profit margins.

Pincushion | definition of pincushion by Medical dictionary

pincushion distortion irregular image produced when axial magnification is greater than peripheral magnification. See: Petzval surface. pincushion distortion 1 inward bowing of gridded straight lines in an image as a result of lens distortion. 2 the image of a square object thus resembling a pincushion or pillow. 3 a distortion of a fluoroscopic image ...

Effect of inlet distortion on the performance of axial ...

The present paper numerically conducted full-annulus investigation on the effects of circumferential total pressure inlet distortion on the performance and flow field of the axial transonic counter-rotating compressor. Results reveal that the inlet distortion both deteriorates the performance of the upstream and downstream rotors resulting in reduction of total pressure ratio, efficiency and ...

A high-order model of rotating stall in axial compressors ...

To the best of the authors' knowledge, this is the first high-order distortion model for describing the stall inception process in axial compressors with inlet distortion.Compared with models presented in previous works,3, 14 the model given in this paper possesses the following three features: (1)

NUMERICAL SIMULATION OF STATIC INFLOW DISTORTION …

20 Int. J. Mech. Eng. & Rob. Res. 2014 Arun Raj S and Pal Pandian P, 2014 NUMERICAL SIMULATION OF STATIC INFLOW DISTORTION ON AN AXIAL FLOW FAN Arun Raj S1* and Pal Pandian P2 *Corresponding Author: Arun Raj S, [email protected] The present CFD analysis is aimed at studying the performance and flow characteristics in an

Axial Compressor Response to Inlet Flow Distortions by a ...

3-D steady and unsteady numerical simulations of the effect on the subsonic axial-flow compressor with the three types of circumferential total-pressure distortion of 1 × 120°, 2 × 60° and 5 ...

Effects of Axial and Radial Distortion on Residual Stress ...

The residual stress caused by the axial and radial distortion in the cut-ring test of HSAW pipe is studied by elastic mechanics theory in this paper, and the effects of the axial and radial distortion on the residual stress of HSAW pipe are analyzed according to the results of the cut-ring test of HSAW pipe section and the mechanical status ...

Strength of Materials and Failure Theories

Strength of Materials and Failure Theories 2010 State of Stress This is a 2D state of stress – only the independent stress components are named. A single stress component z can exist on the z-axis and the state of stress is still called 2D and the following equations apply. To relate failure

Distortion (optics) - Wikipedia

Radial distortion. Although distortion can be irregular or follow many patterns, the most commonly encountered distortions are radially symmetric, or approximately so, arising from the symmetry of a photographic lens.These radial distortions can usually be classified as either barrel distortions or pincushion distortions. See van Walree.

Axial (longitudinal) aberration? - Cambridge in Colour

Jul 27, 2017· Re: Axial (longitudinal) aberration? I am interested in lens elements as, for one thing, I think the Sigma 50mm Art was done very right, and I would like to understand all aspects of it. So I drew the sketch below to try to understand all aspects of the camera (D810) and lens but am uncertain about all my descriptions.

Bleed-Induced Distortion in Axial Compressors | Journal of ...

In this paper, the influence of nonuniform bleed extraction on the stability of an axial flow compressor is quantified. Nonuniformity can be caused by several geometric factors (for example, plenum chamber size or number of off-take ducts), and a range of configurations is examined experimentally in …

What's the difference between axial and radial movement ...

Sep 14, 2015· Axial means along the axis of rotation: Radial means along a radius (a line from the center to the outer surface perpendicular to the axis)

Simple and effective modification of the axial frontonasal ...

Jun 15, 2018· Rieger described the basic design of the dorsal nasal flap used currently. 3 Marchac and Toth designed flaps with an axial vascular pattern by incorporating a constant branch of the angular artery in the pedicle. 4 The axial frontonasal flap has been improved gradually but flap distortion remains an outstanding problem. Therefore, we recommend ...

Simple and effective modification of the axial frontonasal ...

used currently.3 Marchac and Toth designed flaps with an axial vascular pattern by incorporating a constant branch of the angular artery in the pedicle.4 The axial frontonasal flap has been improved gradually but flap distortion remains an out-standing problem. Therefore, we …