Research on Supersonic and Subsonic Field of Externally Pressurized Gas Lubricated Bearing

2014 ◽  
Vol 672-674 ◽  
pp. 1642-1649
Author(s):  
Chang Ting Chen ◽  
Jin Fu Yang ◽  
De Jun Wang
Keyword(s):  
Pressure Distribution ◽  
Calculation Result ◽  
Pressure Loss ◽  
Lower Pressure ◽  
Flow Passage ◽  
Bearing Number

The flow passage including supply hole of externally pressurized gas was investigated. The outlet velocity of supply hole, bearing number and supply pressure’s relationship were built. According to supply hole’s speed, supersonic or subsonic model was chosen to calculate bearing clearance’s pressure distribution. Bearing number’s effects on pressure’s distribution was also studied. The calculation result shows that at larger bearing number, supply hole’s speed is harder to be chocked. Both in supersonic and subsonic condition, larger bearing number produces lower pressure loss.

scholarly journals Design and analysis of flow rectifier of gas turbine flowmeter

2013 ◽  
Vol 17 (5) ◽  
pp. 1504-1507 ◽  
Author(s):  
Zhi-Fei Li ◽  
Zheng Du ◽  
Kai Zhang ◽  
Dong-Sheng Li ◽  
Zhong-Di Su ◽  
...  
Keyword(s):  
Experimental Data ◽  
Flow Field ◽  
Computational Model ◽  
Pressure Distribution ◽  
Gas Turbine ◽  
Turbulence Model ◽  
Pressure Loss ◽  
Three Dimensional ◽  
Turbine Flowmeter ◽  
Good Agreement

Three-dimensional computational model for a gas turbine flowmeter is proposed, and the finite volume based SIMPLEC method and k-? turbulence model are used to obtain the detailed information of flow field in turbine flowmeter, such as velocity and pressure distribution. Comparison between numerical results and experimental data reveals a good agreement. A rectifier with little pressure loss is optimally designed and validated numerically and experimentally.

Effects of Boundary Flow Passage on Pressure Loss in Regenerator

2000 ◽  
Vol 2000.4 (0) ◽  
pp. 99-100
Author(s):  
Manabu SAWADA ◽  
Yohei MAGARA ◽  
Kazuhiro HAMAGUCHI ◽  
Iwao YAMASHITA
Keyword(s):  
Pressure Loss ◽  
Flow Passage ◽  
Boundary Flow

scholarly journals Computational Investigation of Flow Control Methods in the Impeller Rear Cavity

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Guang Liu ◽  
Qiang Du ◽  
Jun Liu ◽  
Pei Wang ◽  
RuoNan Wang ◽  
...  
Keyword(s):  
Flow Control ◽  
Pressure Distribution ◽  
Pressure Loss ◽  
Axial Load ◽  
Turbine Blades ◽  
Rotating Disk ◽  
Radial Position ◽  
Centrifugal Impeller ◽  
Control Methods ◽  
Secondary Air

In typical median and small aeroengines, the air used to realize the functions such as cooling of turbine blades and disks, sealing of turbine cavities and bearing chambers, adjusting of rotating assembly axial load is normally drawn through the rear cavity of centrifugal impeller, so the thorough understanding of flow characteristics and pressure distribution and the proposal of the corresponding control methods in the cavity are the key to design the rational secondary air system. With an impeller rear cavity in a small turbofan engine as an object, the current study was dedicated to the investigation of flow control methods in the cavity. Two methods, namely, baffle and swirl-controlled orifice, were proposed to regulate the pressure loss and distribution in the cavity. Furthermore, the influence of geometry parameters of the two methods such as the length of baffle, the space between the baffle and rotating disk wall, the orientation, and radial position of swirl-controlled orifice was investigated. The CFD results show that the swirl-controlled orifice which could deswirl the flow is more effective in regulating the pressure loss and its distribution in cavity than baffle. The variation of the radial position of the swirl-controlled orifice had little influence on pressure loss but obvious influence on pressure distribution; therefore, decreasing the radial position could reduce the axial load on the rotating disk without changing the outlet pressure.

The one-dimensional gas-lubricated slider bearing

1980 ◽  
Vol 22 (1) ◽  
pp. 75-97
Author(s):  
J. J. Shepherd
Keyword(s):  
Singular Perturbation ◽  
Pressure Distribution ◽  
Singular Perturbation Theory ◽  
Slider Bearing ◽  
Perturbation Problem ◽  
Jump Discontinuities ◽  
Uniqueness Results ◽  
The One ◽  
Bearing Number ◽  
Film Profile

AbstractUnder the appropriate physical hypotheses, the problem of determining the pressure distribution in a gas-filled slider bearing becomes a singular perturbation problem as Λ, the bearing number, tends to infinity. This paper extends the results of an earlier one by the author to consider the case where the film profile has jump discontinuities in slope at points interior to the bearing. Application of the methods of general singular perturbation theory establishes the appropriate existence-uniqueness results for this problem, and a means is devised by which uniformly valid asymptotic approximations to the pressure distribution may be obtained for large values of Λ.

Variations des efforts hydrodynamiques sur radiers horizontal et affouillé en aval d'un dissipateur d'énergie de type auge

2007 ◽  
Vol 34 (7) ◽  
pp. 890-894
Author(s):  
A El Amri ◽  
J L Verrette
Keyword(s):  
Energy Dissipation ◽  
Pressure Distribution ◽  
Pressure Fluctuation ◽  
Type A ◽  
Lower Pressure ◽  
Type I ◽  
Reduced Pressure ◽  
Equilibrium Pressure ◽  
Bed Scour ◽  
Stable Flow

The distribution of the hydrodynamic efforts under solid horizontal or scoured bed downstream of a roller bucket spillway can be represented by two typical distributions: type A and B for pressure and type I and II for pressure fluctuation. However, the scoured bed presents a pressure distribution that is closer to the equilibrium pressure compared with that of the horizontal bed and a much lower pressure fluctuation distribution. This could be due to the bed scour in the vicinity of the bucket that carries an effective value for the height of the bucket lip, which decreases the suction effect, and the fact that the eroded shape of the bed corresponds with reduced pressure efforts, which translates into weaker turbulence and therefore a more stable flow. These results show the advantage of a scoured bed that could be more secure when the bucket lip height of the roller bucket spillway is well chosen.Key words: hydrodynamic efforts, pressure, pressure fluctuation, hydraulic energy dissipation, roller bucket.

scholarly journals Pressure Distribution in Turbine Flow Passage of Torque Converter.

1998 ◽  
Vol 64 (617) ◽  
pp. 136-141
Author(s):  
Masatoshi YAMADA ◽  
Kenji IMAI ◽  
Atsushi NAKASHIMA ◽  
Akira HOSHINO
Keyword(s):  
Pressure Distribution ◽  
Torque Converter ◽  
Flow Passage

Research Note: Performance of an Externally Pressurized Gas Porous Thrust Bearing

1974 ◽  
Vol 16 (5) ◽  
pp. 351-352
Author(s):  
P. R. K. Murti
Keyword(s):  
Pressure Distribution ◽  
Closed Form ◽  
Flow Rate ◽  
Thrust Bearing ◽  
Load Capacity ◽  
Axial Flow ◽  
Static Stiffness ◽  
Thrust Pad ◽  
Bearing Number ◽  
Compressible Lubricant

A circular porous thrust pad, externally pressurized with a compressible lubricant and with predominantly axial flow in the bearing matrix, is analysed. Closed-form expressions are derived for pressure distribution, load capacity, mass flow rate and static stiffness of the bearing. It is concluded that optimum performance of the bearing is obtained when it operates close to the critical bearing number.

Aerodynamic Performance Investigation of Modern Marine Gas Turbine Intake System

2012 ◽  
Author(s):  
Peng Sun ◽  
Haiyang Gao ◽  
Jingjun Zhong ◽  
Muxiao Yang
Keyword(s):  
Pressure Distribution ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Pressure Loss ◽  
Total Pressure ◽  
Aerodynamic Performance ◽  
Operating Conditions ◽  
Measuring Point ◽  
Intake System ◽  
Flow Parameters

Gas turbines (GTs) have been used on board for many years. To safe guard these engines working efficiently and stably, several types of air intake system have been employed. The aerodynamic performance of marine gas turbine intake system is one of the important aspects which is associated with the marine operating conditions and should be studied carefully. In this paper, numerical simulation is carried out on the flow parameters of a vessel and her intake system. How vessel operating conditions and the environment conditions influence the intake system inlet boundary is studied firstly. Under some certain assumptions, the intake inlet total pressure value and the angle between wind and heading direction approximately follow the sine law. Then, unsteady simulation is carried out on the intake system. The total pressure loss variation and which measuring point can represent the pressure loss properly are discussed. It is found that the total pressure distribution varies with the measuring location. Following this, flow parameters at the volute outlet is analyzed in detail, especially the flow field structure and the distortion intensity. The total pressure distribution is non-uniform, which will influence the GT performance and stability significantly.

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