Hydrodynamic Dynamometer Shutter for Load Fluctuation Control
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Solution Overview
Problem
High-power engines, particularly large-capacity gas turbines, face unstable output and excessive load fluctuation due to cavitation issues in existing hydrodynamic-type hydraulic dynamometers, leading to potential damage and inefficiency in performance testing.
Innovation Solution
A hydrodynamic-type hydraulic dynamometer with a shutter mechanism that adjusts the flow rate of recirculating fluid through a toroidal chamber, using a control slit and actuator to stabilize output and reduce load fluctuations by controlling the opening degree of the slit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a hydrodynamic-type hydraulic dynamometer is used for large-capacity gas turbines, then power measurement capability is improved, but output stability deteriorates due to cavitation and load fluctuation
Solution Approach 1:
A shutter mechanism is introduced as an intermediary component between the fluid supply and the toroidal chamber. This shutter controls the flow rate of recirculating fluid, acting as a mediator to stabilize the hydraulic resistance and prevent cavitation, thereby resolving the contradiction between power measurement capability and output stability
Solution Approach 2:
The invention changes the flow rate parameter of the recirculating fluid by adjusting the shutter opening degree. By controlling this parameter, the hydraulic resistance is stabilized, which prevents cavitation and load fluctuation while maintaining the dynamometer's power measurement capability for large-capacity gas turbines
2Reliability
If recirculating fluid flow rate is increased to improve measurement stability, then output stability is improved, but device complexity increases due to additional control mechanisms
Solution Approach 1:
A shutter mechanism is introduced as an intermediary component between the fluid supply and the toroidal chamber. This shutter controls the flow rate of recirculating fluid, acting as a mediator to stabilize the hydraulic resistance and prevent cavitation, thereby resolving the contradiction between power measurement capability and output stability
Solution Approach 2:
The invention changes the flow rate parameter of the recirculating fluid by adjusting the shutter opening degree. By controlling this parameter, the hydraulic resistance is stabilized, which prevents cavitation and load fluctuation while maintaining the dynamometer's power measurement capability for large-capacity gas turbines
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively stabilizes output and reduces load fluctuations, enhancing the reliability and accuracy of performance testing for large-capacity gas turbines by controlling the flow rate of the recirculating fluid, thereby preventing damage and improving measurement stability.
Implementation Method 1
a runner rotatably coupled to the shaft and causing a fluid introduced into the toroidal chamber to flow therethrough
Implementation Method 2
a shutter configured to adjust an opening degree of the control slit
Implementation Method 3
A hydraulic dynamometer absorbs engine power transmitted to the dynamometer by hydraulic resistance between a rotor, a stator, and a housing
Data Source
Figure 1
Figure 2~3
Figure 4A~4B
AI summary
A hydrodynamic-type hydraulic dynamometer is provided. The hydrodynamic-type hydraulic dynamometer includes a shaft rotatably mounted by a plurality of bearings, a stator fixed around the shaft and having a toroidal chamber therein, a runner rotatably coupled to the shaft and causing a fluid introduced into the toroidal chamber to flow therethrough, an inner ring mounted to extend inwardly from a radially outer side of the toroidal chamber and having a control slit formed therethrough, and a shutter configured to adjust an opening degree of the control slit.