The variable area cavitating venturi is an effective means to throttle the mass flow rate of liquid. The mass flow rate is a function of the upstream pressure, the pintle stroke, the density and saturation pressure of...
详细信息
The variable area cavitating venturi is an effective means to throttle the mass flow rate of liquid. The mass flow rate is a function of the upstream pressure, the pintle stroke, the density and saturation pressure of the liquid, independent of the downstream pressure. In this paper, a variable area cavitating venturi is designed and four different sets of experiments are conducted to investigate the performance of the variable area cavitating venturi. In these experiments, the mass flow rates are examined under different pintle positions, upstream pressures, downstream pressures and dynamic motions of the pintle. The experimental results indicate that the mass flow rate is independent of the downstream pressure when the ratio of the downstream pressure to upstream pressure is less than 0.8. The mass flow rate is almost linearly dependent on the pintle stroke for a constant upstream pressure. The discharge coefficient is a function of the pintle stroke, whereas the upstream and downstream pressures have rare influence on the discharge coefficient. The variable area cavitating venturi can control and measure the mass flow rate dynamically by determining the pintle stroke and the upstream pressure. (C) 2014 Elsevier Ltd. All rights reserved.
The paper discusses synthesis and physical implementation of decentralized supervisory controller of the dynamic flow controller (DFC) as a discrete-event system. The local plants have been used for synthesizing of de...
详细信息
ISBN:
(纸本)9781424422227
The paper discusses synthesis and physical implementation of decentralized supervisory controller of the dynamic flow controller (DFC) as a discrete-event system. The local plants have been used for synthesizing of decentralized supervisory controller for easier implementation of overall control system. A heuristic method is developed for easier implementation of the supervisor on a Programmable-Logic-controller (PLC), to overcome the implementation problems in the auto/manual mode of DFC operation. A step-by-step procedure is developed to generate a ladder diagram which implements the DES supervisory control on a PLC. The proposed approach for implementation of modular controllers can be used to implement any modular supervisory control in practice.
This paper presents two new methods for power flow calculation of power systems in presence of dynamic flow controller (DFC), which is a new member of FACTS controllers. In first method A new steady state model of DFC...
详细信息
ISBN:
(纸本)9781424428946
This paper presents two new methods for power flow calculation of power systems in presence of dynamic flow controller (DFC), which is a new member of FACTS controllers. In first method A new steady state model of DFC is introduced for the implementation of the device in the conventional Newton-Raphson power now algorithm. The impact of DFC on power flow is accommodated by adding new entries and modifying some existing ones in the linearized Jacobian equations of the same system without DFC. The focus of second method is. on the discrete nature of the DFC and including its effects on power flow. This method is based on Nabavi model for FACTS devices. A case study on a power system located in northern of IRAN shows the effectiveness of proposed methods.
暂无评论