Research on key structural parameters for multi-stage reciprocating compressor

2018 ◽  
Author(s):  
Xiaohui Gao ◽  
Yongguang Liu ◽  
Hong Guo
Keyword(s):  
Structural Parameters ◽  
Reciprocating Compressor ◽  
Multi Stage

scholarly journals Optimization of Clearance Volume for Performance Improvement of Reciprocating Compressor

2019 ◽  
Vol 8 (10) ◽  
pp. 1688-1694
Keyword(s):  
Performance Improvement ◽  
Working Condition ◽  
Optimal Time ◽  
Reciprocating Compressor ◽  
Stroke Length ◽  
Design And Optimization ◽  
Multi Stage ◽  
Compressor Performance ◽  
Effective Part ◽  
Piston Stroke

The paper addresses to engineers who do design and optimization work in the field of reciprocating compressors. In this paper theoretical and exact contemplations are given which permit to foresee the valve misfortunes. Suction valve misfortunes are additionally bring about a decrease of limit. The most effective part in the development of a reciprocating compressor depends strongly on improvement of its performance. For this purpose, a performance characteristic evaluation of a two stroke reciprocating air compressor is carried out in this paper. By and large stream misfortunes of compressor valves are affected by the valve geometry as well as are intensified by valve pocket misfortunes. The aims were to improve compressor performance by illustrating the effects of various parameters such as clearance between head and piston, stroke length, friction losses, compressor running time, background working condition and air leakage. The effect of each parameter was compared with given performance condition and after it was demonstrated the most important parameter on the performance. The parameter was measured using three techniques. The experiment addressed some factors that led to the inefficient performance of the reciprocating compressor air system and cause energy losses. The results advocate the optimal time for starting time of starting each stage of the two–stage reciprocating compressor. The work in addition may give a insight for the development of the design of multi-stage compression and presents some key design parameter.

scholarly journals Vibration reduction of a single cylinder reciprocating compressor based on multi-stage balancing

2011 ◽  
Vol 46 (1) ◽  
pp. 1-9 ◽  
Author(s):  
N. Levecque ◽  
J. Mahfoud ◽  
D. Violette ◽  
G. Ferraris ◽  
R. Dufour
Keyword(s):  
Vibration Reduction ◽  
Reciprocating Compressor ◽  
Single Cylinder ◽  
Multi Stage

Research on Characteristics of a New Marine Gas Turbine Exhaust Ejector Device

2016 ◽  
Author(s):  
Tao Sun ◽  
Lanxin Sun ◽  
Yigang Luan ◽  
Peng Sun
Keyword(s):  
Gas Turbine ◽  
Performance Optimization ◽  
Structural Parameters ◽  
Research Result ◽  
Exhaust System ◽  
Reference Value ◽  
Multi Stage ◽  
Gas Turbine Exhaust ◽  
And Performance ◽  
Turbine Exhaust

Naval ships, as well as commercial ships, are exposed to more risks than before with the development of IR-guided threats. IR Suppress System (IRSS) is used to reduce or eliminate the infrared signatures of exhaust system of the ship. In order to optimize the structure of exhaust ejector and shorten the cycle of research, it is essential to study the successful experiences on exhaust ejectors by scholars abroad. In this article two structure innovations are introduced: an improved structure of nozzle and multi-stage diffuser; A new type of exhaust ejector for marine gas turbine is designed. Through simplifying the ejector model, numerical simulation is applied to forecast the characteristics of both the single-stage ejector and the multistage ejector. Result indicates the effects of structural parameters on the performance parameters. This research result has certain reference value for marine gas turbine exhaust ejector design and performance optimization.

scholarly journals Numerical simulation on heating performance and emission characteristics of a new multi-stage dispersed burner for gas-fired radiant tubes

2021 ◽  
pp. 323-323
Author(s):  
Huanbao Fan ◽  
Junxiao Feng ◽  
Wei Bai ◽  
Yujie Zhao ◽  
Weidong Li ◽  
...  
Keyword(s):  
Temperature Difference ◽  
Wall Temperature ◽  
Thermal Efficiency ◽  
Structural Parameters ◽  
Nox Reduction ◽  
Nozzle Diameter ◽  
Nox Emission ◽  
Multi Stage ◽  
Secondary Fuel ◽  
Fuel Nozzle

To enhance the temperature uniformity and NOx reduction performance of the gas-fired radiant tubes, we proposed a new multi-stage dispersed burner based on fuel-staging combustion technology in this study. The effect of fuel nozzle structural parameters, including secondary fuel nozzle distance D (30, 50, 70 mm), secondary fuel nozzle diameter ds (2, 3, 4, 5, 6 mm) and tertiary fuel nozzle diameter dt (2.5, 5, 7.5, 10 mm) on the flow field, temperature distribution, NOx generation and thermal efficiency were analyzed by numerical simulations. The results show that the multi-stage dispersed fuel nozzle could slow down the combustion rate and form a low-oxygen dilution zone in the reaction process, reducing the maximum combustion temperature and NOx emission. With the increase of the secondary fuel nozzle distance, the NOx concentration at the outlet decreased from 69.0 ppm to 54.6 ppm, and a decrease of 20.9%. When the secondary fuel nozzle diameter increased from 2 mm to 6 mm, the maximum wall temperature difference gradually increased 72.8 K to 76.3 K. NOx emission at the outlet first decreased, then increased, and was as low as 45.6 ppm at a 5 mm diameter. Furthermore, increasing the tertiary fuel nozzle diameter could reduce the maximum wall temperature difference and NOx emission, and improve thermal efficiency. When dt = 7.5 mm, the overall performance of the radiant tube was the best, and the outlet NOx concentration, wall temperature difference and thermal efficiency were 46.1 ppm, 73.0 K, 63.7%, respectively.

The Research on Characteristics of a New Type of Marine Gas Turbine Exhaust Ejector Device

2014 ◽  
Vol 540 ◽  
pp. 114-117
Author(s):  
Tao Sun ◽  
Ming Fei Zhang ◽  
Chang Jiang Sun ◽  
Zheng Wei Ma
Keyword(s):  
Gas Turbine ◽  
Performance Optimization ◽  
Structural Parameters ◽  
Research Result ◽  
Exhaust System ◽  
Multi Stage ◽  
New Type ◽  
Ejector Device ◽  
Gas Turbine Exhaust ◽  
Turbine Exhaust

Marine gas turbine exhaust ejector device is responsible for reducing or eliminating the infrared signatures of exhaust system. In order to optimize the structure of exhaust ejector and shorten the cycle of research, it is essential to study the successful experiences on exhaust ejectors by scholars abroad. In this article two structure innovations were introduced: the nozzle structure changing from circular to rectangular and multi-stage diffuser, then a new type of marine gas turbine exhaust ejector was designed. Through simplifying the ejector model, numerical simulation was used to predict the characteristics of both the single-stage ejector and the multi-stage ejector. The result indicates the effects of structural parameters on the performance parameters. This research result has certain reference value for marine gas turbine exhaust ejector structure innovations and performance optimization.

Planning and Search in Multi-Stage Risky Decision Making

2011 ◽  
Author(s):  
Jared Hotaling ◽  
Jerry Busemeyer ◽  
Richard Shiffrin
Keyword(s):  
Decision Making ◽  
Risky Decision Making ◽  
Risky Decision ◽  
Multi Stage

Optimal design of a high homogeneous and small-size shim coil for atomic spin gyroscope based on 0-1 linear programming

2020 ◽  
Vol 64 (1-4) ◽  
pp. 165-172
Author(s):  
Dongge Deng ◽  
Mingzhi Zhu ◽  
Qiang Shu ◽  
Baoxu Wang ◽  
Fei Yang
Keyword(s):  
Linear Programming ◽  
Power Consumption ◽  
Low Power ◽  
Optimization Design ◽  
Structural Parameters ◽  
Axial Position ◽  
Low Power Consumption ◽  
Optimal Method ◽  
Atomic Spin ◽  
Shim Coil

It is necessary to develop a high homogeneous, low power consumption, high frequency and small-size shim coil for high precision and low-cost atomic spin gyroscope (ASG). To provide the shim coil, a multi-objective optimization design method is proposed. All structural parameters including the wire diameter are optimized. In addition to the homogeneity, the size of optimized coil, especially the axial position and winding number, is restricted to develop the small-size shim coil with low power consumption. The 0-1 linear programming is adopted in the optimal model to conveniently describe winding distributions. The branch and bound algorithm is used to solve this model. Theoretical optimization results show that the homogeneity of the optimized shim coil is several orders of magnitudes better than the same-size solenoid. A simulation experiment is also conducted. Experimental results show that optimization results are verified, and power consumption of the optimized coil is about half of the solenoid when providing the same uniform magnetic field. This indicates that the proposed optimal method is feasible to develop shim coil for ASG.

Effects of Cooking Oil Subsidy Removals on Related Markets in Malaysia: A Comparative Static, Multicommodity, Multi Stage Production Approach

2011 ◽  
Author(s):  
Jamal Othman ◽  
Yaghoob Jafari
Keyword(s):  
Equilibrium Model ◽  
Comparative Statics ◽  
Partial Equilibrium ◽  
Cooking Oil ◽  
Multi Stage ◽  
Supply Factor ◽  
Partial Equilibrium Model ◽  
Factor Markets ◽  
Input Markets ◽  
Production Approach

Malaysia is contemplating removal of most of her subsidy support measures including subsidies on cooking oil which is largely palm oil based. This paper aims to examine the effects of cooking oil subsidy removals on the competitiveness of the oil palm subsector and related markets. This is done by developing and applying a comparative static, multi-commodity, partial equilibrium model with multi-stages of production function for the Malaysian perennial crops subsector which explicitly links different stages of production, primary and intermediate input markets, trade, and policy linkages. Results partly suggest that export of cooking oil will increase by 0.2 per cent due to a 10 per cent cooking oil subsidy reduction, while domestic output of cooking oil may eventually see a net decline of 1.97 per cent. The results clearly point out that the effect of reducing cooking oil subsidies is relatively small at the upstream levels and therefore it only induces minute effects on factor markets. Consequently, the market for other agricultural crops is projected to change very marginally.   Keywords: Multicomodity, comparative statics, partial equilibrium model, output supply-factor markets linkages, effects of cooking oil subsidy removals.

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