| 摘要 |
A flow meter having a laser Doppler anemometer (LDA) which measures the instantaneous centerline velocity of fluid flow in a pipe and processes the instantaneous velocity so obtained to compute the volumetric flow rate, mass rate, and other flow characteristics as instantaneous quantities and/or integrated over a time interval using an electronic processing method which provides an exact solution to the Navier-Stokes equations for any periodically oscillating flow. The flow meter is particularly adapted for measuring the flow characteristics of high pressure automotive fuel injection systems. Three embodiments of the flow meter are described, including a stationary stand (110) for off-line bench testing flow rate in a fuel injection system (116, 118, 120), a portable flow meter (170) for inline testing in a vehicle's fuel line, and an on-board flow meter sensor (200) connected to an engine control module (214).
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