advance ratio


Also found in: Encyclopedia.
Related to advance ratio: propeller efficiency

advance ratio

n
1. (Aeronautics) the ratio of wind speed along the axis of a rotor or propeller to the speed of the blade tip
2. (Aeronautics) the ratio of forward flight speed to the speed of the rotor tip of a helicopter
References in periodicals archive ?
They reported thrust and power coefficients as well as propulsive efficiencies of the propellers in terms of the advance ratio for different rotational speeds.
We use energy consumption on progress ratio and advance ratio to measure the energy consumption of our proposed protocol.
This loan facility has a final maturity of five years from the date of delivery of each vessel and bears interest at LIBOR plus a margin ranging between 1.95% and 2.40% per annum (depending on the advance ratio).
Steady-state simulations were conducted on both hubs with an inlet velocity of 150 knots, a hub rotational rate of 500rpm and an advance ratio of 0.36, similar to advance ratios on a full-scale rotorcraft.
Borrowing formula advance ratio: These vary widely among asset-based lending institutions.
The propeller performance, at different combinations of propeller speed (n) and forward speed (U)--using the advance ratio, J = U/nD--can be characterized in terms of thrust coefficient ([C.sub.T]), power coefficient, [C.sub.p] = 2[pi]Q/([rho][n.sup.2][D.sup.5]), and efficiency, [eta] = J [C.sub.T]/[C.sub.p].
It can be observed that the performance coefficient curve slightly shifts to the left, and the change in the advance ratio is approximately 0.005-0.01.
The isosurfaces of the Q-criterion of the isolated SRP configuration and CROR configuration are shown in Figure 10 at the advance ratio J = 173779, which demonstrate numerical simulations of the configuration flow field characterized by Mach number.
Further examination of airload comparisons at other advance ratios (not shown) indicates that wind tunnel modeling becomes important at advance ratios greater than [mu] = 0.37 and that LRTA modeling becomes increasingly important as the advance ratio increases.
This phenomenon is more evident when the advance ratio decreases.
On top of providing superior advance ratios and flexibility of structures, leases, typically lasting more than five years, Standard Chartered Bank will also help clients lock in fixed rates over a longer term to mitigate the volatility in short term charter rates.