The Scaling of Pressure Fluctuations From Equal-Tee Piping Components for In-Plant Noise Prediction

2003 ◽  
Author(s):  
Denis G. Karczub ◽  
Fred W. Catron ◽  
Allen C. Fagerlund
Keyword(s):  
Pressure Fluctuation ◽  
High Speed ◽  
Gas Flow ◽  
Characteristic Curve ◽  
Internal Noise ◽  
High Mass ◽  
Piping System ◽  
Gas Density ◽  
System Components ◽  
Fluctuation Scaling

An important element of in-plant noise modeling for high-speed gas flow, in addition to the noise generated by control valves, is the noise due to piping system components such as tees which becomes significant at high mass flow rates. An effective tool for the modeling of noise due to piping system components is non-dimensional pressure fluctuation scaling. The current paper outlines procedures for characterization of the internal noise due to an equal tee with unequal outlet flows using non-dimensional pressure fluctuation scaling. Experimental data is presented demonstrating general collapse of the measured data onto a single characteristic curve for several combinations of flow velocity and gas density under steady-state flow conditions. Flow ratios of 1:2, 1:3, 1:4 and 2:3 between each of the two outlet legs from the equal tee are considered, as well as the affect of gas density over a range of 345kPaG to 1380kPaG.

scholarly journals Study of Compressible High Speed Gas Flow in Piping System : 2nd Report, Piping Systems with Sudden Enlargement

1980 ◽  
Vol 23 (186) ◽  
pp. 2005-2012 ◽  
Author(s):  
Takaaki MORIMUNE ◽  
Naomichi HIRAYAMA ◽  
Toshiyuki MAEDA
Keyword(s):  
High Speed ◽  
Gas Flow ◽  
Piping System ◽  
Piping Systems ◽  
Sudden Enlargement

scholarly journals Study of Compressible High Speed Gas Flow in Piping System : 3rd Report, Flow Characteristics in Junctions

1981 ◽  
Vol 24 (198) ◽  
pp. 2082-2089 ◽  
Author(s):  
Takaaki MORIMUNE ◽  
Naomichi HIRAYAMA ◽  
Toshiyuki MAEDA
Keyword(s):  
High Speed ◽  
Gas Flow ◽  
Flow Characteristics ◽  
Piping System

scholarly journals Study of ComPressible High Speed Gas Flow in Piping System : 1st Report, Piping Systems with Bends or Elbows

1980 ◽  
Vol 23 (186) ◽  
pp. 1997-2004 ◽  
Author(s):  
Takaaki MORIMUNE ◽  
Naomichi HIRAYAMA ◽  
Toshiyuki MAEDA
Keyword(s):  
High Speed ◽  
Gas Flow ◽  
Piping System ◽  
Piping Systems

scholarly journals Influence of Gas Density and Plug Diameter on Plume Characteristics by Ladle Stirring

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 475
Author(s):  
Dmitrii Riabov ◽  
Muhammad Murtaza Gain ◽  
Tomasz Kargul ◽  
Olena Volkova
Keyword(s):  
High Speed ◽  
Gas Flow ◽  
Gas Bubbles ◽  
Similarity Criteria ◽  
Porous Plug ◽  
Cold Model ◽  
Gas Density ◽  
Image Velocimetry ◽  
Expansion Angle ◽  
Real Objects

The paper presents new results concerning the influence of the gas density and porous plug diameter on the nature of liquid steel stirring with an inert gas in the ladle. The tests were carried out on a cold model of a 30t ladle using particle image velocimetry (PIV) with a high-speed camera to analyse the plume zone formed during the supply of argon and helium as a stirring gas. The similarity criteria for the investigation of stirring processes in cold model in the past were discussed and compared. The modified Morton number was used in this paper to relate the gas flow rate in the model with real objects. The presented results constitute complete documentation of the influence of the plug diameter and gas density on the size of formed gas bubbles and the velocity of gas bubbles rising in different zones of the plume, plume, and spout geometry, including the expansion angle, spout height, open eye area, and gas hold-up.

scholarly journals High-Speed Elevator Car Air Pressure Compensation Method Based on Coupling Analysis of Internal and External Flow Fields

2021 ◽  
Vol 11 (4) ◽  
pp. 1700
Author(s):  
Lemiao Qiu ◽  
Huifang Zhou ◽  
Zili Wang ◽  
Shuyou Zhang ◽  
Lichun Zhang ◽  
...  
Keyword(s):  
Pressure Fluctuation ◽  
Iterative Learning Control ◽  
High Speed ◽  
Learning Control ◽  
Flow Fields ◽  
External Flow ◽  
Iterative Learning ◽  
Air Pressure ◽  
Coupling Analysis ◽  
Pressure Compensation

As the demand for high-speed elevators grows, the requirements of elevator performance have also developed. The high speed will produce strong airflow disturbances and drastic pressure changes, which is prone to cause passenger discomfort. In this paper, an elevator car air pressure compensation method based on coupling analysis of internal and external flow fields (IE-FF) is proposed. It helps to adaptively track the ideal air pressure curve (IAPC) inside the car and controls the air pressure fluctuation to improve the ride comfort of the elevator. To obtain the air pressure transient value in the elevator car, an IE-FF modeling method is proposed. Based on the IE-FF model, the air pressure compensation system is developed. To realize the air pressure compensation inside the car, an adaptive iterative learning control (A-ILC) algorithm is proposed, to eliminate the passengers’ ear pressing due to the severe air pressure fluctuation. To verify the proposed method, the KLK2 (Canny Elevator Co., Ltd., 2015, Suzhou, China) high-speed elevator is applied. The numerical experiment results show that the proposed method has higher tracking accuracy and convergence speed compared to the classical Proportion Integral Differential (PID) algorithm and the Proportion Integral-iterative learning control (PD-ILC) algorithm.

scholarly journals Heat Transmission in High Speed Gas Flow (3rd Report)

1952 ◽  
Vol 18 (67) ◽  
pp. 31-35
Author(s):  
Kensuke KAWASHIMO ◽  
Shigebumi AOKI
Keyword(s):  
High Speed ◽  
Gas Flow ◽  
Heat Transmission

Experimental Inverstigations On the Pressure Fluctuations in the Sealing Gap of Dry Gas Seals with Embedded Pressure Sensors

2021 ◽  
Author(s):  
Jingjing Luo ◽  
Dieter Brillert
Keyword(s):  
High Speed ◽  
Gas Flow ◽  
Static Pressure ◽  
Pressure Sensors ◽  
Operating Conditions ◽  
Test Facility ◽  
Experimental Investigations ◽  
Mechanical Seals ◽  
Process Gas ◽  
Sealing Gap

Abstract Dry gas lubricated non-contacting mechanical seals (DGS), most commonly found in centrifugal compressors, prevent the process gas flow into the atmosphere. Especially when high speed is combined with high pressure, DGS is the preferred choice over other sealing alternatives. In order to investigate the flow field in the sealing gap and to facilitate the numerical prediction of the seal performance, a dedicated test facility is developed to carry out the measurement of key parameters in the gas film. Gas in the sealing film varies according to the seal inlet pressure, and the thickness of gas film depends on this fluctuated pressure. In this paper, the test facility, measurement methods and the first results of static pressure measurements in the sealing gap of the DGS obtained in the described test facility are presented. An industry DGS with three-dimensional grooves on the surface of the rotating ring, where experimental investigations take place, is used. The static pressure in the gas film is measured, up to 20 bar and 8,100 rpm, by several high frequency ultraminiature pressure transducers embedded into the stationary ring. The experimental results are discussed and compared with the numerical model programmed in MATLAB, the characteristic and magnitude of which have a good agreement with the numerical simulations. It suggests the feasibility of measuring pressure profiles of the standard industry DGS under pressurized dynamic operating conditions without altering the key components of the seal and thereby affecting the seal performance.

Influence of the Variation of Plasma Torch Parameters on Particle Melting and Solidification

1997 ◽  
Author(s):  
M. Vardelle ◽  
P. Fauchais ◽  
A. Vardelle ◽  
A.C. Léger
Keyword(s):  
Flow Rate ◽  
High Speed ◽  
Gas Flow ◽  
Operating Conditions ◽  
Characteristic Parameters ◽  
Powder Mass ◽  
Arc Current ◽  
Plasma Sprayed ◽  
Carrier Gas Flow ◽  
Melting And Solidification

Abstract A study of the flattening and cooling of particles plasma-sprayed on a substrate is presented. The characteristic parameters of the splats are linked to the parameters of the impacting particles by using an experimental device consisting of a phase Doppler particle analyzer and a high-speed pyrometer. However, during the long experiments required to get reliable correlations, it was observed that variations in plasma spray operating conditions may alter the particles behavior in the plasma jet. Therefore, a simple and easy-to-use system was developed to control in real time the spray jet. In this paper, the effect of carrier gas flow rate, arc current and powder mass flow rate is investigated. The results on zirconia and alumina powders show the capability of the technique to sense the particle spray position and width.

High Speed Gas Density Measurements Using Proton Induced X-Rays

1979 ◽  
Vol 26 (1) ◽  
pp. 1411-1413 ◽  
Author(s):  
G. M. Thomson ◽  
K. A. Jamison
Keyword(s):  
High Speed ◽  
X Rays ◽  
Gas Density ◽  
Density Measurements
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