Measurement of the Air Pressure for a Rotary Vane Compressor

2003 ◽  
Author(s):  
Yuan Mao Huang ◽  
Sheng An Yang
Keyword(s):  
Frequency Converter ◽  
Air Pressure ◽  
Cover Plate ◽  
Rotary Compressor ◽  
Compression Phase ◽  
Pressure Transducers ◽  
Compressor Rotor ◽  
Two Phases ◽  
Rotary Vane Compressor ◽  
Type Pressure

This study introduces an experimental method that can measure air pressures in the vane segments when a sliding-vane rotary compressor performs suction and compression phases in stable or unstable rotational speeds. When the air pressures of these two phases can be measured, the intake effect of the compressor’s inlet and the seal effect of the vane segments can be evaluated, respectively. Because a frequency converter provides unstable rotational speeds when it controls rotational speeds of a motor with a compressor, an encoder mounted on the output shaft of the motor was applied to record the angular location of the compressor rotor. Two strain gauge type pressure transducers were inserted into the cover plate of the compressor to measure air pressures in the vane segments. Comparing the signals of the encoder with pressure transducers, the air pressures in completions of suction and compression phases could be determined in stable or unstable rotational speeds. The air pressures when the compressor performed suction and compression phases were 99.5 kPa and 153 kPa, respectively, in 1400 rpm. The air pressure when the compressor performed suction phase decreased with the rotational speed faster than 800 rpm. The size or shape of the inlet port of the compressor should be enlarged or modified to provide the suction air pressure without dropping too much. The designed air pressure when the compressor performed compression phase was 244 kPa in 140 rpm, the manufacture precision of the compressor should be increased to decrease leakage.

Investigation of Squeeze Film Damper Forces Produced by Circular Centered Orbits

1978 ◽  
Vol 100 (1) ◽  
pp. 15-21 ◽  
Author(s):  
E. Feder ◽  
P. N. Bansal ◽  
A. Blanco
Keyword(s):  
Aircraft Engine ◽  
Analytical Investigation ◽  
Operating Conditions ◽  
Squeeze Film ◽  
Oil Viscosity ◽  
Pressure Transducers ◽  
Pressure Distributions ◽  
Pressure Profiles ◽  
Force Components ◽  
Type Pressure

This paper presents the results of an experimental and analytical investigation of the dynamic forces generated by a squeeze film bearing damper constrained to move in circular centered orbits. These orbits were mechanically produced in a specially designed, end sealed, test rig. Aircraft engine damper geometry and operating conditions were simulated. The effect of journal speed, oil viscosity, inlet pressure, and eccentricity ratio on the damper performance was studied. The pressure distributions about the journal were measured for each test condition by high-response diaphragm-type pressure transducers. These pressure profiles were numerically integrated to determine the force components of the squeeze film. Experimental results were compared to an analysis which is summarized in this paper and included the effects of inlet and cavitation pressures. The “long bearing theory” was found to be reasonably accurate in predicting the shape and magnitude of the pressure distribution. Considerable emphasis was directed to the study of the circumferential pressure distributions between 180 deg and 360 deg since aircraft engine dampers generally operate in this region. For the cavitated film (i.e., pressure distributions less than 360 deg), accurate prediction of the damper forces was found to be critically dependent on the effect of inlet and cavitation pressures.

Transient Pressure Measurements by Recess-Mounted Transducers

2003 ◽  
Author(s):  
Jim C. P. Liou ◽  
Guohua Li
Keyword(s):  
Measurement System ◽  
Rise Time ◽  
Pressure Measurements ◽  
Transient Pressure ◽  
Source Pressure ◽  
Pressure Transducers ◽  
Transient Source ◽  
Gaseous Media ◽  
Type Pressure ◽  
General Method

Recess-mounted diaphragm-type pressure transducers are often used in measuring transient pressures. When the rise time of the source pressure is very fast, ringing of the transducer may occur. This study investigates the ringing of such a transducer numerically and experimentally for the purpose of developing a general method to recover transient source pressures. The approach is based on modeling the transient hydraulics of the measurement system. Favorable comparisons between the recovered pressure traces with those measured by a flush-mounted transducer were obtained. The proposed method makes recess-mounted transducers viable for measuring rapidly changing pressures in both liquid and gaseous media.

Field Observation of Tide-Induced Loading Upon Undersea Tunnel

2012 ◽  
Author(s):  
Nan Chen ◽  
Guan-lin Ye ◽  
Jin-jian Chen ◽  
Xiao-he Xia
Keyword(s):  
Linear Relation ◽  
Nuclear Power ◽  
Cooling Water ◽  
Earth Pressure ◽  
Tidal Height ◽  
Tidal Level ◽  
Pressure Transducers ◽  
Power Stations ◽  
Earth Pressures ◽  
Type Pressure

Many shallow undersea tunnels have been built to circulate the cooling water for the thermal or nuclear power stations in recent years. In current study, a field monitoring of tide-influenced earth pressure on the tunnel was carried out by using the pad type pressure transducers. The variation of tidal level was also recorded carefully. The measured results of earth pressures and the tidal height were analyzed qualitatively and quantitatively. It can be found that there is a linear relation between the variation of load and tidal height. The computed values of the loadings based on tunnel pressure theory are almost the same with measurements.

A Latching Mechanism for Unloading a Rotary Compressor

1999 ◽  
Author(s):  
Joseph L. Smith ◽  
Michael D. Webb ◽  
Stephen D. Umans
Keyword(s):  
Air Conditioning ◽  
Rotary Compressor ◽  
Electronic Control ◽  
Motor Speed ◽  
Air Conditioning System ◽  
Mechanical Unloading ◽  
Potential Alternative ◽  
Residential Air Conditioning ◽  
Rotary Vane Compressor ◽  
Capacity Performance

Abstract A vane latching mechanism for unloading a rotary vane compressor is described. Mechanical unloading is proposed as a potential alternative to electronic control of motor speed for variable compressor capacity. Performance of a demonstration compressor operating at part capacity in a residential air conditioning system is described.

The Load Acting on Bearings of Rotary Compressor Sliding Vanes

2003 ◽  
Author(s):  
Yuan Mao Huang ◽  
Chien Liang Li
Keyword(s):  
Air Pressure ◽  
Rotary Compressor ◽  
Experimental Setup ◽  
Radial Load ◽  
Compression Process ◽  
Measured Load ◽  
Polytropic Process ◽  
Study Designs ◽  
Further Development ◽  
Polytropic Exponent

This study designs extended rods with bearings for vanes and guider slots on covered plates to improve the performance of a sliding vane rotary compressor and determines the load acting on the bearings and vanes. A polytropic process with a polytropic exponent was assumed during the compression process to calculate the air pressure in the vane segments. The air pressure was used with Newton’s law to calculate loads acting on bearings and vanes. A compressor and experimental setup were also built to measure the radial load acting on the bearings. The measured load acting on the bearing was then compared with the calculated results. The exponent constant of 1.05 determined can be used for the further development of the compressor.

Correcting for Response Lag in Unsteady Pressure Measurements in Water

1993 ◽  
Vol 115 (4) ◽  
pp. 676-679 ◽  
Author(s):  
Rand N. Conger ◽  
B. R. Ramaprian
Keyword(s):  
Dynamic Response ◽  
Pressure Transducer ◽  
Water Channel ◽  
Inadequate Response ◽  
Pressure Measurements ◽  
Pressure Transducers ◽  
Pitching Airfoil ◽  
Unsteady Pressure ◽  
Unsteady Pressure Measurements ◽  
Type Pressure

There is not much information available on the use of diaphragm-type pressure transducers for the measurement of unsteady pressures in liquids. A procedure for measuring the dynamic response of a pressure transducer in such applications and correcting for its inadequate response is discussed in this report. An example of the successful use of this method to determine unsteady surface pressures on a pitching airfoil in a water channel is presented.

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