The New Semi-Experimental Method for Simulation of Turbine Flow Meters Rotation in the Transitional Flow
The new semi-experimental method for simulation of the turbine flow meters rotation in the transitional flow has been developed. The method is based on the experimentally established exponential low of changing of dimensionless relative turbine gas meter rotation frequency and meter inertia time constant. For experimental evaluation of the meter time constant special facility has been developed. The facility ensures instant switching of turbine meter under test from one channel to the other channel with different flow rate and measuring the meter response. The developed method can be used for evaluation and predication of the turbine meters response and dynamic error in the transitional flow with any arbitrary law of flow rate changing. The examples of the method application are presented. Keywords—Dynamic error, pulsing flow, numerical simulation, response, turbine gas meters.
Gas turbine flowmeter measurement of pulsating flow
A theoretical analysis of a gas-turbine flowmeter in the measurement of pulsating flow, including both fluid drag and nonfluid drag on the rotor system and dealing with pulsating flow of arbitrary wave shape, appears to be validated by a wide range of test results except for a large pulsation index where the situation is more complex and needs further investigation. The meter pulsation error of a gas-turbine flowmeter may be estimated with reasonable accuracy for a known pulsating-flow situation using steady-state values of fluid drag and nonfluid drag. Test results indicate a gas-turbine flowmeter retains its excellent steady-state repeatability in pulsating flow, which is a necessary condition for possible measurement of pulsating flow. The results of the analysis provide basic information for the increased understanding of turbine flowmeter behavior.
A NOVEL FORM OF X-RAY DIFFRACTION MICROBEAM CAMERA
A description is given of a microbeam camera employing a conical film for back reflection. Diffraction angles and angular spacing between diffraction spots may be easily and accurately measured, and a large amount of data may be recorded on a small conical film with reduced exposure times. An advantage of the camera is the reduction of geometrical distortion in the shape of diffraction spots. The instrument has been employed for structural studies of graphite crystals.