Positive displacement turbine - A novel solution to the pressure differential control valve failure problem and energy utilization

Energy ◽  
2020 ◽  
Vol 190 ◽  
pp. 116400 ◽  
Author(s):  
Arihant Sonawat ◽  
Seung-Jun Kim ◽  
Hyeon-Mo Yang ◽  
Young-Seok Choi ◽  
Kyung-Min Kim ◽  
...  
Keyword(s):  
Control Valve ◽  
Pressure Differential ◽  
Energy Utilization ◽  
Positive Displacement ◽  
Differential Control

scholarly journals OPTIMIZATION OF PARAMETERS OF THE MOBILE MACHINE ADAPTIVE HYDRAULIC CIRCUIT

2021 ◽  
Vol 13 (3) ◽  
pp. 14-21
Author(s):  
Yurii Buriennikov ◽  
◽  
Leonid Kozlov ◽  
Oana Rusu ◽  
Viktor Matviichuk ◽  
...  
Keyword(s):  
Hydraulic System ◽  
Control Valve ◽  
Fast Response ◽  
Optimization Criterion ◽  
Pressure Differential ◽  
Hydraulic Circuit ◽  
Operating Modes ◽  
Differential Control ◽  
Mobile Machine ◽  
Hydraulic Circuits

Mobile machine hydraulic circuits tend to adopt electrohydraulics. Such hydraulic circuits are based on controlled pumps, modulated hydraulics, sensors and controllers. This allows adapting the hydraulic circuit operating modes to the changes of external conditions of the machine operation. Application of hydraulic circuits with electrohydraulics in mobile machines allows to use mobile machines efficiently with a high number of removable endangers, increases their performance and improves the quality of performed works. The authors propose an adaptive hydraulic circuit for a mobile machine. The operation process in the adaptive hydraulic circuit in static and dynamic modes is determined by the interaction of the pump controller and pressure differential control valves. The hydraulic system operation stability, its fast response and readjustment are determined by the controller parameters. It has been revealed that the main parameters affecting the dynamic characteristics of the hydraulic system are: throttle area and coefficient of amplifying the pump controller orifice, dampener area and coefficient of amplifying the pressure differential control valve orifice. These parameters affect the stability, controlling and readjustment time in the hydraulic circuit differently. A functional including the values of controlling time , σ controlling and losses in the pump controller was used as an optimization criterion. The optimization has been made according to the developed mathematical model applying the method developed by I. Sobol and R. Statnikov. During the optimization each controller parameter changed on 3 levels. 81 tests were made and the best combination of controller parameters for the optimization criterion was determined. The following hydraulic circuit operation values were reached under the optimal values of parameters = 1.0·10-6 m2, = 1.0·10-3 m, = 1.2·10-6 m2, = 10·10-3 m: = 1.1 с, σ = 32 %, = 0.82 kW that comply with the requirements towards hydraulic circuits of mobile machines.

Effect of Stator Geometry on the Performance of a Positive Displacement Hydraulic Turbine

2019 ◽  
Author(s):  
Arihant Sonawat ◽  
Jin-Hyuk Kim ◽  
Seung-Jun Kim ◽  
Young-Seok Choi ◽  
Hyeon-Mo Yang ◽  
...  
Keyword(s):  
Control Valve ◽  
Hydraulic Turbine ◽  
Primary Objective ◽  
Low Flow ◽  
Working Fluid ◽  
Pipeline System ◽  
Positive Displacement ◽  
Ansys Cfx ◽  
Differential Control ◽  
Water Supply Pipeline

Abstract Positive displacement turbine (PDT) is a special class of hydraulic turbine which finds its usage in the applications involving very low flow rates with high heads and very low specific speeds. In the present case, a PDT was designed and developed to replace the pressure differential control valve (PDCV) and to harness the unused differential pressure energy from the water supply pipeline system. The turbine was designed considering the on-site available head and flowrate. The rotors were twisted to damp the fluctuations in pressure, flow rate and torque. The primary objective of the present study was to analyze the effect of the stator shape on the performance of PDT using Computational Fluid Dynamics approach. The governing equations of the fluid flow were solved using an unsteady approach to capture accurately the pulsating nature of the flow using ANSYS CFX v17.1. Initially a circular stator turbine was used for transporting the working fluid to and from the turbine rotors and later the effects of square and rectangular shaped stator designs were also checked. It was observed that the performance of the PDT slightly improved with rectangular and square stators in terms of hydraulic efficiency than with circular stator with low flow fluctuations.

Numerical Analysis on Cavitation Erosion of a High Pressure Differential Control Valve

2016 ◽  
Author(s):  
Zhijian Zheng ◽  
Guofu Ou ◽  
Haojie Ye ◽  
Haozhe Jin
Keyword(s):  
Numerical Simulation ◽  
High Pressure ◽  
Cavitation Erosion ◽  
Saturation Pressure ◽  
Control Valve ◽  
Pressure Differential ◽  
Physical Parameters ◽  
Fluid Temperature ◽  
Operational Conditions ◽  
Differential Control

The numerical simulation on the cavitation erosion of a high pressure differential control valve is conducted. The characteristic of cavitation flow is obtained by using full cavitation model and RNG k-ε turbulence model with actual operational conditions and fluid physical parameters. Results showed that: the flow velocity increases rapidly as the fluid passes through the gap between the valve spool and seat. Simultaneously the local static pressure decreases below the saturation pressure of the fluid, then the cavitation is formed. For the convergent - expansion structure, the flow separation occurs due to the pressure recovery, which leads to the formation of recirculation zone, where the cavitation cloud appears. The increases of fluid temperature and inlet pressure or the decreases of valve spool angle and valve opening result in the enlargement of cavitation area and enhancement of cavitation intensity. The numerical simulation results correlate well with actual failure morphologies, which proves that the method can be successfully applied in the cavitation prediction of a high pressure differential control valve.

scholarly journals Characterization of Limacon Gas Expanders With Consideration to the Dynamics of Apex Seals and Inlet Control Valve

2018 ◽  
Vol 140 (12) ◽  
Author(s):  
Truong H. Phung ◽  
Ibrahim A. Sultan
Keyword(s):  
Fluid Velocity ◽  
Control Valve ◽  
Working Fluid ◽  
Inlet Valve ◽  
Positive Displacement ◽  
Working Volume ◽  
Thermodynamic Performance ◽  
Circular Curves

Limaçon machine, of which the relative motion between the rotor and housing follows the limaçon curve, belongs to a class of rotary positive displacement machines. The profiles of rotors and housings of those machines can be constructed of either limaçon or circular curves, hence the names: limaçon-to-limaçon, circolimaçon, and limaçon-to-circular machines. This paper presents the investigation into the thermodynamic performance of the limaçon-to-circular machines with the presence of apex seals and inlet valve. This paper sets out by briefly introducing the limaçon technology and the construction of the limaçon-to-circular machine working volume. The mathematical descriptions of ports' positions and areas have also been introduced. The paper then discusses the flow and phase composition of working fluid through the working chambers as well as how the fluid velocity is modeled and calculated. Then the seal dynamic model and response of inlet valve are presented followed by the machine thermodynamic model. A case study has also been presented to show the responses of seals and inlet valve during the machine operation.

Proportional Hydraulic Directional Control Valve with Planar Distribution and Differential Control

2015 ◽  
Vol 772 ◽  
pp. 324-328
Author(s):  
Mihai Avram ◽  
Despina Duminică ◽  
Tudor Cătălin Apostolescu
Keyword(s):  
Control Valve ◽  
Flow Section ◽  
Positioning System ◽  
Original Solution ◽  
Directional Control ◽  
Differential Control ◽  
Directional Control Valve ◽  
Mechanical Feedback

The paper presents an original solution of hydraulic proportional directional control valve with planar distribution and differential control. The characteristic of the flow section is established and an example of such directional control valve integrated in the structure of a hydraulic positioning system with mechanical feedback is given.

Distributed Entropy Energy-Efficient Clustering algorithm for cluster head selection (DEEEC)

2020 ◽  
Vol 39 (6) ◽  
pp. 8139-8147
Author(s):  
Ranganathan Arun ◽  
Rangaswamy Balamurugan
Keyword(s):  
Energy Efficient ◽  
Clustering Algorithm ◽  
Cluster Head ◽  
Residual Energy ◽  
Energy Utilization ◽  
Sensor Nodes ◽  
Second Stage ◽  
Energy Efficient Clustering ◽  
Two Stages ◽  
Ch Selection

In Wireless Sensor Networks (WSN) the energy of Sensor nodes is not certainly sufficient. In order to optimize the endurance of WSN, it is essential to minimize the utilization of energy. Head of group or Cluster Head (CH) is an eminent method to develop the endurance of WSN that aggregates the WSN with higher energy. CH for intra-cluster and inter-cluster communication becomes dependent. For complete, in WSN, the Energy level of CH extends its life of cluster. While evolving cluster algorithms, the complicated job is to identify the energy utilization amount of heterogeneous WSNs. Based on Chaotic Firefly Algorithm CH (CFACH) selection, the formulated work is named “Novel Distributed Entropy Energy-Efficient Clustering Algorithm”, in short, DEEEC for HWSNs. The formulated DEEEC Algorithm, which is a CH, has two main stages. In the first stage, the identification of temporary CHs along with its entropy value is found using the correlative measure of residual and original energy. Along with this, in the clustering algorithm, the rotating epoch and its entropy value must be predicted automatically by its sensor nodes. In the second stage, if any member in the cluster having larger residual energy, shall modify the temporary CHs in the direction of the deciding set. The target of the nodes with large energy has the probability to be CHs which is determined by the above two stages meant for CH selection. The MATLAB is required to simulate the DEEEC Algorithm. The simulated results of the formulated DEEEC Algorithm produce good results with respect to the energy and increased lifetime when it is correlated with the current traditional clustering protocols being used in the Heterogeneous WSNs.

Recovering waste energy of the combined gas turbine system using paraffin melting

2020 ◽  
Vol 14 (4) ◽  
pp. 7481-7497
Author(s):  
Yousef Najjar ◽  
Abdelrahman Irbai
Keyword(s):  
Melting Process ◽  
Payback Period ◽  
Energy Utilization ◽  
Raw Material ◽  
Heat Transfer Fluid ◽  
Layered System ◽  
Exhaust Gas ◽  
Gas Temperature ◽  
Power Cycle ◽  
Waste Energy

This work covers waste energy utilization of the combined power cycle by using it in the candle raw material (paraffin) melting process and an economic study for this process. After a partial utilization of the burned fuel energy in a real bottoming steam power generation, the exhaust gas contains 0.033 of the initially burned energy. This tail energy with about 128 ºC is partly driven in the heat exchanger of the paraffin melting system. Ansys-Fluent Software was used to study the paraffin wax melting process by using a layered system that utilizes an increased interface area between the heat transfer fluid (HTF) and the phase change material (PCM) to improve the paraffin melting process. The results indicate that using 47.35 kg/s, which is 5% of the entire exhaust gas (881.33 kg/s) from the exit of the combined power cycle, would be enough for producing 1100 tons per month, which corresponds to the production quantity by real candle's factories. Also, 63% of the LPG cost will be saved, and the payback period of the melting system is 2.4 years. Moreover, as the exhaust gas temperature increases, the consumed power and the payback period will decrease.

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