tip clearance

tip clearance

[′tip ‚klir·əns]
(naval architecture)
The clearance or distance between the circumference of the tip circle of a propeller and the hull of the vessel.
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References in periodicals archive ?
Additional improvement has been made with the development of a special kneading barrel (NIC), (3-4) which expands the concept that tip clearance affects the kneading performance.
The near-stall conditions with a smooth casing (without a casing treatment) can induce vortex flows originating from the tip clearance flow crossing the tip gap.
The copilot noted that the blade tip clearance was going to be close, but made no comment to the HAC who was talking on the radio.
As part of the students' work, they used a scale model to identify a calibration system to assess running tip clearance in steam turbine blades used to make electricity in power stations, creating computer software to analyse the results.
Senoo and Ishida (1987) observed the deterioration of compressor performance due to tip clearance of centrifugal impeller.
type of mixer, rotor design, rotor speed, even or friction rotor speeds, water temperatures, type of cooling system, tip clearance, fill factor, etc.
The new design is aimed at eliminating compressor surge at high power take-off, by providing more rigorous tip clearance control, and is based on Pratt & Whitney's 112-inch PW4000 engine design which has proven experience with 3 million hours and 1.
From the direct 3-D numerical calculation, we obtained several simultaneous physical properties such as velocity distribution, leakage flow from tip clearance or side gaps (18, 19), etc.
E3E technology includes: a two-stage shroudless HP turbine incorporating advanced 3D aerodynamics and blade cooling technology; a novel tip clearance control system with advanced ceramic abradable linings to improve turbine efficiency and increase performance retention; a lean burn combustion system; a blisked HP compressor which has successfully demonstrated a 22:1 pressure ratio in only 9 stages, with world-class levels of efficiency and validated surge margin capability; and an innovative air system for bearing load management and improved cooling using novel carbon oil seal and brush-seal air sealing technologies.
The advantage of the small tip clearance is that it reduces the dead areas on the mixer sides, leading to improved cooling capacity.
Since the values in the tip clearance and the intermeshing regions are higher than in other regions, dispersive mixing is enhanced by the polymer melt that passes through these regions.
They are available in various L/D ratios with varying ratios of land width to tip clearance ratio and can be configured in a number of different ways depending on the application.