Time-Accurate Flow Field and Rotor Speed Measurements of a Pulsed Detonation Driven Turbine

2011 ◽  
Author(s):  
Kurt Rouser ◽  
Paul King ◽  
Frederick Schauer ◽  
Rolf Sondergaard ◽  
Larry Goss ◽  
...  
Keyword(s):  
Flow Field ◽  
Rotor Speed ◽  
Pulsed Detonation

Performance Evaluation of an Unsteady Turbine Driven by a Pulsed Detonation Combustor

2011 ◽  
Author(s):  
Kurt P. Rouser ◽  
Paul I. King ◽  
Frederick R. Schauer ◽  
Rolf Sondergaard ◽  
John L. Hoke
Keyword(s):  
Reverse Flow ◽  
Brayton Cycle ◽  
Rotor Speed ◽  
Performance Improvements ◽  
Pulsed Detonation ◽  
Time Histories ◽  
Exit Temperature ◽  
Shaft Torque ◽  
Low Entropy ◽  
Gas Pressures

Replacing a Brayton cycle near constant-pressure combustor with a pulsed detonation combustor (PDC) may take advantage of potential performance improvements from low-entropy, pressure-gain heat addition. In this paper, the radial turbine of a Garrett automotive turbocharger is coupled to a hydrogen fueled PDC. Unsteady turbine power is obtained with a conventional dynamometer technique. Sampling frequencies greater than 10 kHz resolve rapid flowfield transients of confined detonations which occur in less than a millisecond and include peak gas pressures exceeding 4 MPa and peak gas temperatures greater than 2,400 K. Results include 6 ms time histories of turbine inlet and exit temperature, pressure, mass flow, and enthalpy during blowdown of a PDC. The unsteady inlet flowfield included momentary reverse flow, which was not observed at the turbine exit. Full pulsed detonation cycle time histories of turbine power, rotor speed, rotational energy and net shaft torque are included to describe the turbine response to detonations. Rotor speed is periodic and net shaft torque oscillates in response to a detonation. Results are shown for fill fractions ranging from 0.5 to 1.0 with a 0.5 purge fraction. PDC operating frequencies in this study range from 10 Hz to 25 Hz.

Experimental and Analytical Surge Cycle Analysis of a High Pressure Aero Engine Compressor

2012 ◽  
Author(s):  
Phillip Waniczek ◽  
Harald Schoenenborn ◽  
Peter Jeschke
Keyword(s):  
Flow Field ◽  
Reverse Flow ◽  
Flow Direction ◽  
Specific Work ◽  
Rotor Speed ◽  
Suction Surface ◽  
Trailing Edge ◽  
Wide Range ◽  
Aero Engine ◽  
Engine Compressor

The unsteady flow field during surge of the front rotor of an eight-stage axial aero engine compressor has been investigated experimentally and analytically. For that purpose, two newly designed multi-sensor probes are installed up- and downstream of the first rotor. Surge experiments are conducted at four different speed lines (75–93% speed) covering a wide range of the compressor map and measurements have been taken at two different channel heights (50% and 70% span). The results show that the flow field varies extremely during surge up- and downstream of the rotor. In contrast to the flow at the rotor leading edge, which is nearly independent of the rotor speed, the flow at the rotor trailing edge is highly dependent of the rotor speed. Therefore, the performance of the rotor during surge is dependent on the reverse through-flow of the stators. At low speeds the flow passes the stators without any changes in the flow direction. If speed is increased the reverse flow is guided more and more by the stators. These different flow conditions have a direct impact on the process of energy conversion of the rotor during the surge event. The incoming reverse flow at the rotor trailing edge impinges on the blade from the suction surface side at lower speeds and turns to the pressure surface side when speed is increased. Hence, the deviation and specific work grow. In addition to the surge experiments simulations of the surge events are conducted with a 1D code called SYSQ3D. The simulations and experiments match well and underline the capability of the new multi-sensor probes to accurately measure the flow patterns during surge.

Flow Field Analysis and Response Surface Research on the Rotor in Dry Powder Inhaler

2014 ◽  
Vol 983 ◽  
pp. 242-245
Author(s):  
Zhi Chen Cao ◽  
Hao Ying Li ◽  
Shi Hong Shi ◽  
En Long Zhou
Keyword(s):  
Flow Field ◽  
Response Surface ◽  
Flow Rate ◽  
Dry Powder Inhaler ◽  
Field Analysis ◽  
Performance Curve ◽  
Rotor Speed ◽  
Dry Powder ◽  
Flow Field Analysis ◽  
Relationship Of

In order to find out the correspond relationship of the outlet velocity and rotor speed in dry powder inhaler, the intermediate parameter was inserted in Workbench response surface based on CFD. The simulation of the suction drive rotor rotation mechanism was based on MRF model in FLUENT. It can be easily obtained the rotor’s performance curve under different aerodynamic conditions and found out the optimized flow rate is 66.127L/min. This method verifies the clinical phenomena and could guide the clinical research and machinery optimization.

scholarly journals Internal Flow of a High Specific-Speed Diagonal-Flow Fan (Rotor Outlet Flow Fields with Rotating Stall)

2003 ◽  
Vol 9 (5) ◽  
pp. 337-344 ◽  
Author(s):  
Norimasa Shiomi ◽  
Wen-Xin Cai ◽  
Akio Muraoka ◽  
Kenji Kaneko ◽  
Toshiaki Setoguchi
Keyword(s):  
Flow Field ◽  
Three Dimensional ◽  
Internal Flow ◽  
Flow Fields ◽  
Rotating Stall ◽  
Rotor Blades ◽  
Rotor Speed ◽  
Double Phase ◽  
Outlet Flow ◽  
Specific Speed

We carried out investigations for the purpose of clarifying the rotor outlet flow fields with rotating stall cell in a diagonal-flow fan. The test fan was a high–specific-speed (ns=1620) type of diagonal-flow fan that had 6 rotor blades and 11 stator blades. It has been shown that the number of the stall cell is 1, and its propagating speed is approximately 80% of its rotor speed, although little has been known about the behavior of the stall cell because a flow field with a rotating stall cell is essentially unsteady. In order to capture the behavior of the stall cell at the rotor outlet flow fields, hot-wire surveys were performed using a single-slant hotwire probe. The data obtained by these surveys were processed by means of a double phase-locked averaging technique, which enabled us to capture the flow field with the rotating stall cell in the reference coordinate system fixed to the rotor. As a result, time-dependent ensemble averages of the three-dimensional velocity components at the rotor outlet flow fields were obtained. The behavior of the stall cell was shown for each velocity component, and the flow patterns on the meridional planes were illustrated.

Numerical Study of the Combined Free-Forced Convection and Mass Transfer Flow Past a Vertical Porous Plate in a Porous Medium with Heat Generation and Thermal Diffusion

2006 ◽  
Vol 11 (4) ◽  
pp. 331-343 ◽  
Author(s):  
M. S. Alam ◽  
M. M. Rahman ◽  
M. A. Samad
Keyword(s):  
Mass Transfer ◽  
Flow Field ◽  
Differential Equations ◽  
Forced Convection ◽  
Heat Generation ◽  
Numerical Study ◽  
Porous Plate ◽  
Integration Scheme ◽  
Suction Parameter ◽  
Transfer Flow

The problem of combined free-forced convection and mass transfer flow over a vertical porous flat plate, in presence of heat generation and thermaldiffusion, is studied numerically. The non-linear partial differential equations and their boundary conditions, describing the problem under consideration, are transformed into a system of ordinary differential equations by using usual similarity transformations. This system is solved numerically by applying Nachtsheim-Swigert shooting iteration technique together with Runge-Kutta sixth order integration scheme. The effects of suction parameter, heat generation parameter and Soret number are examined on the flow field of a hydrogen-air mixture as a non-chemical reacting fluid pair. The analysis of the obtained results showed that the flow field is significantly influenced by these parameters.

ATOMIZATION CHARACTERISTICS OF LIQUID JETS INJECTED INTO A HIGH-VELOCITY FLOW FIELD

1994 ◽  
Vol 4 (4) ◽  
pp. 451-471 ◽  
Author(s):  
Nobuyuki Yatsuyanagi ◽  
Hiroshi Sakamoto ◽  
Kazuo Sato
Keyword(s):  
Flow Field ◽  
High Velocity ◽  
Liquid Jets ◽  
High Velocity Flow ◽  
Velocity Flow ◽  
Atomization Characteristics
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