Cavitation is a common flow phenomena in most hydraulic turbines and has the potential to cause vibration, blade surface damage and performance loss. Despite the fact that crossflow turbines have been used in small-scale hydropower systems for a long time, cavitation has not been studied in these turbines. In this paper, we present the findings of a computational study on cavitation inception i...

This paper describes the modeling of the various components in a pitch controlled wind energy system and the design of the pitch controller, and discusses the response of the pitch-controlled system to wind velocity variations. The investigated pitch control system was observed to have a large output power variation and settling time. The pitch function provides full control over the mechanical...

Vibrations of the basic assemblies hydrogen generator cause variable forces and loads that occurduring operation depending on operating mode. This paper presents some test results performed a Kaplanvertical type turbine. Measurements were at 3 measuring points (N1, N2 N3; Figure 1) using noncontactsensors, placed in pairs under 90 each point. Based measurements theanalysis obtained results, fol...

The effective utilization of micro hydropower sources is often realized through the use pumps as turbines (PAT). efficiency PAT about same that original pump. A further increase in and power output can be achieved by modifying parts interacting with flow, especially impeller adjacent volute casing draft tube. This paper presents a user-friendly calculation model Francis turbine design its appli...

Torque measurement is paramount in engine and transmission testing, turbine testing, pump testing and testing of gear trains and power measurement within propulsion systems. Monitoring torque can be critical to the performance of axles, drive trains, gear drives, and electric and hydraulic motors. Other in-plant applications include gas and steam turbines. Really, torque is an important factor ...

The general objective of this work is to evaluate the application impact of the RCM (Reliability-Centered Maintenance) methodology on a power generating system. The RCM warrants significant improvements in the maintenance-functions performance, and also an increase in reliability and availability of equipments. It permits the definition of a maintenance planning in a structured form. It was dev...

The characteristics of hydraulic turbine governing system change with operating conditions, therefore the governor must be capable of providing satisfactory control under different operating points. For this reason a design method of robust PID controller is proposed. The effects of the characteristic variations are defined as uncertainties in the system model, and based on this model, the requ...

A mathematical model and simulation analysis on main control valve mechanism of LNG ship steam turbine are carried out. A reasonable modeling division of main control valve mechanism is achieved in accordance with the idea of modular modeling, and all the models are established respectively. The modeling division includes cam lifting mechanism, oil actuator and double-valve body. The state spac...

Hydraulic turbine discharges in low-head hydroelectric plants, and plants with awkward intake geometries can be measured relatively easily with the Acoustic Scintillation Flowmeter (ASFM). The ASFM is non-intrusive, and may be deployed in intake gate slots in a straightforward manner, lending itself to multiple measurements in the same plant. Examples of measurements in two generating stations ...

Acoustic resonances in Francis turbines often define undesirable limitations to their operating ranges at high load. The knowledge of the mechanisms governing the onset and the sustenance of these instabilities in the swirling flow leaving the runner is essential for the development of a reliable hydroacoustic model for the prediction of system stability. The present work seeks to study experim...