scholarly journals Research on the Pressure Ratio Characteristics of a Swash Plate-Rotating Hydraulic Transformer

Energies ◽  
2018 ◽  
Vol 11 (6) ◽  
pp. 1612 ◽  
Author(s):  
Chongbo Jing ◽  
Junjie Zhou ◽  
Shihua Yuan ◽  
Siyuan Zhao
Keyword(s):  
Pressure Ratio ◽  
Hydraulic Transformer ◽  
Swash Plate

Displacement Characteristics of Variable Hydraulic Transformer

2014 ◽  
Vol 543-547 ◽  
pp. 741-746 ◽  
Author(s):  
Guan Zhong Yang ◽  
Ji Hai Jiang
Keyword(s):  
Flow Rate ◽  
Load Flow ◽  
Hydraulic Transformer ◽  
Swash Plate

A new kind of hydraulic transformer, called variable hydraulic transformer (VHT), has been proposed to control its load flow rate. The displacement characteristics of VHT are investigated in detail. The mathematic models are concluded and optimized. Matlab is used to simulate and calculate, finding that there are 5 controlled angles of the port plate that can help define displacement characteristics of VHT. The relationships between the displacement characteristics and the structure in VHT are shown. The results demonstrate the performance laws of VHT when the controlled angles of the port plate and of the swash plate change.

scholarly journals The Impact of Rotor Torques for the Pressure Ratio Characteristics of the Double Rotor Hydraulic Transformer

IEEE Access ◽  
2021 ◽  
Vol 9 ◽  
pp. 14228-14238
Author(s):  
Zhongxun Liu ◽  
Qiaoyan Liu ◽  
Zhipeng Xi ◽  
Jihai Jiang
Keyword(s):  
Pressure Ratio ◽  
Hydraulic Transformer ◽  
The Impact

Errata

1966 ◽  
Vol 31 (2) ◽  
pp. 208-208
Keyword(s):  
Cleft Palate ◽  
Pressure Ratio ◽  
Ration Group

In the February 1966 issue of this journal, two errors occurred in Joan C. Pitzner’s and Hughlett L. Morris’s article “Articulation Skills and Adequacy of Breath Pressure Ratios of Children with Cleft Palate.” On page 29, the heading “Reality” should be “Reliability,” and on page 30, the heading “Pressure-Ration Group One” should be “Pressure-Ratio Group One.”

Development of Experimental P-Y Curves from Centrifuge Tests for Piles Subjected to Static Loading and Liquefaction-Induced Lateral Spreading

2020 ◽  
Vol 14 (1) ◽  
Author(s):  
Milad Souri
Keyword(s):  
Static Loading ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Pressure Ratio ◽  
Lateral Spreading ◽  
American Petroleum Institute ◽  
Unique Contribution ◽  
Pile Groups ◽  
Centrifuge Tests ◽  
Centrifuge Models

The results of five centrifuge models were used to evaluate the response of pile-supported wharves subjected to inertial and liquefaction-induced lateral spreading loads. The centrifuge models contained pile groups that were embedded in rockfill dikes over layers of loose to dense sand and were shaken by a series of ground motions. The p-y curves were back-calculated for both dynamic and static loading from centrifuge data and were compared against commonly used American Petroleum Institute p-y relationships. It was found that liquefaction in loose sand resulted in a significant reduction in ultimate soil resistance. It was also found that incorporating p-multipliers that are proportional to the pore water pressure ratio in granular materials is adequate for estimating pile demands in pseudo-static analysis. The unique contribution of this study is that the piles in these tests were subjected to combined effects of inertial loads from the superstructure and kinematic loads from liquefaction-induced lateral spreading.

Compressor Issues for Hydrogen Production and Transmission Through a Long Distance Pipeline Network

2008 ◽  
Vol 59 (4) ◽  
Author(s):  
Fred Starr ◽  
Calin-Cristian Cormos ◽  
Evangelos Tzimas ◽  
Stathis Peteves
Keyword(s):  
Pressure Ratio ◽  
High Strength Steels ◽  
High Strength ◽  
Energy System ◽  
Pipeline System ◽  
Hydrogen Energy ◽  
Long Distance ◽  
System Pressure ◽  
Production Of Hydrogen ◽  
Plant Exit

A hydrogen energy system will require the production of hydrogen from coal-based gasification plants and its transmission through long distance pipelines at 70 � 100 bar. To overcome some problems of current gasifiers, which are limited in pressure capability, two options are explored, in-plant compression of the syngas and compression of the hydrogen at the plant exit. It is shown that whereas in-plant compression using centrifugal machines is practical, this is not a solution when compressing hydrogen at the plant exit. This is because of the low molecular weight of the hydrogen. It is also shown that if centrifugal compressors are to be used in a pipeline system, pressure drops will need to be restricted as even an advanced two-stage centrifugal compressor will be limited to a pressure ratio of 1.2. High strength steels are suitable for the in-plant compressor, but aluminium alloy will be required for a hydrogen pipeline compressor.

scholarly journals 5 MW Closed Cycle Gas Turbine

1984 ◽  
Author(s):  
John L. Mason ◽  
Anthony Pietsch ◽  
Theodore R. Wilson ◽  
Allen D. Harper
Keyword(s):  
Power Systems ◽  
Gas Turbine ◽  
Oil Recovery ◽  
Low Cost ◽  
Pressure Ratio ◽  
Commercial Application ◽  
Solid Fuels ◽  
Closed Cycle ◽  
Emission Standards ◽  
Fluidized Bed Combustor

A novel closed-cycle gas turbine power system is now under development by the GWF Power Systems Company for cogeneration applications. Nominally the system produces 5 megawatts (MW) of electric power and 80,000 lb/hr (36,287 kg/hr) of 1000 psig (6895 kPa) steam. The heat source is an atmospheric fluidized bed combustor (AFBC) capable of using low-cost solid fuels while meeting applicable emission standards. A simple, low-pressure ratio, single spool, turbomachine is utilized. This paper describes the system and related performance, as well as the development and test efforts now being conducted. The initial commercial application of the system will be for Enhanced Oil Recovery (EOR) of the heavy crudes produced in California.

Mid-Term Outcomes After Unifocalization Guided by Intraoperative Pulmonary Flow Study

2021 ◽  
Vol 12 (1) ◽  
pp. 76-83
Author(s):  
Ariana Goodman ◽  
Michael Ma ◽  
Yulin Zhang ◽  
Kathleen R. Ryan ◽  
Ozzie Jahadi ◽  
...  
Keyword(s):  
Pulmonary Circulation ◽  
Septal Defect ◽  
Pressure Ratio ◽  
Major Aortopulmonary Collateral Arteries ◽  
Intracardiac Repair ◽  
Pulmonary Flow ◽  
Collateral Arteries ◽  
Complete Repair ◽  
The Relationship ◽  
Flow Study

Background: Repair of tetralogy of Fallot (TOF) with major aortopulmonary collateral arteries (MAPCAs) requires unifocalization of pulmonary circulation, intracardiac repair with the closure of the ventricular septal defect, and placement of a right ventricle (RV) to pulmonary artery (PA) conduit. The decision to perform complete repair is sometimes aided by an intraoperative flow study to estimate the total resistance of the reconstructed pulmonary circulation. Methods: We reviewed patients who underwent unifocalization and PA reconstruction for TOF/MAPCAs to evaluate acute and mid-term outcomes after repair with and without flow studies and to characterize the relationship between PA pressure during the flow study and postrepair RV pressure. Results: Among 579 patients who underwent unifocalization and PA reconstruction for TOF/MAPCAs, 99 (17%) had an intraoperative flow study during one (n = 91) or more (n = 8) operations to determine the suitability for a complete repair. There was a reasonably good correlation between mean PA pressure at 3 L/min/m2 during the flow study and postrepair RV pressure and RV:aortic pressure ratio. Acute and mid-term outcomes (median: 3.8 years) after complete repair in the flow study patients (n = 78) did not differ significantly from those in whom the flow study was not performed (n = 444). Furthermore, prior failed flow study was not associated with differences in outcome after subsequent intracardiac repair. Conclusions: The intraoperative flow study remains a useful adjunct for determining the suitability for complete repair in a subset of patients undergoing surgery for TOF/MAPCAs, as it is reasonably accurate for estimating postoperative PA pressure and serves as a reliable guide for the feasibility of single-stage complete repair.

Sign in / Sign up

Export Citation Format

Share Document