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The narrow clearance between the rotor (first set of blades) and the casing is visible. Tip clearance is the distance between the tip of a rotating airfoil and a stationary part. Gas turbine: Rotor blade and casing [1] Propeller (ship or aircraft): Propeller and structure [2] Ground tip clearance ; Wind turbine: blade and tower [3]
Top Secret is a more stringent clearance. A Top Secret, or "TS", clearance, is often given as the result of a Single Scope Background Investigation , or SSBI. Top Secret clearances, in general, afford one access to data that affects national security , counterterrorism / counterintelligence , or other highly sensitive data.
In order to have access to material in a particular SCI "compartment", the person must first have the clearance level for the material. The SCI designation is an add-on, not a special clearance level. Someone cleared at the SECRET level for some compartment X cannot see material in compartment X that is classified TOP SECRET.
Active clearance control (ACC) is a method used in large aircraft gas turbines to improve fuel efficiency during cruise. This is achieved by setting the turbine tip clearance at more than one operating point and contrasts with passive clearance control which sets it for only one condition and is explained below.
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The Mach number increases gradually from midspan to tip. At the tip, the effect is less than secondary flow, tip clearance effect, and annulus wall boundary-layer effect. In a turbofan, shock losses increase overall efficiency by 2% because of the absence of tip clearance effect and secondary flow being present.
It is also called lash or play. In the context of gears, backlash is clearance between mating components, or the amount of lost motion due to clearance or slackness when movement is reversed and contact is re-established. In a pair of gears, backlash is the amount of clearance between mated gear teeth.
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