Wind Tunnel Ground Effect Test

% Wind Tunnel Ground Effect Test - Basic Sizing clear; clc; % Test requirements c = 0.2; % Wing chord (m) b = 0.6; % Wing span (m) V_test = 25; % Test section velocity (m/s) nu = 1.5e-5; % Kinematic viscosity (m²/s) % Test section sizing (blockage < 5%) S_wing = c * b; S_ts_min = S_wing / 0.05; % Minimum test section area W_ts = 0.4; % Test section width (m) H_ts = 0.4; % Test section height (m) S_ts = W_ts * H_ts; % Reynolds number Re = V_test * c / nu; % Contraction ratio (typical 5-7) CR = 6; A_settling = CR * S_ts; V_settling = V_test / CR; % Simple pressure loss estimate (K values from literature) K_screen = 1.2; K_honeycomb = 0.3; K_corner = 0.2 * 4; % 4 corners K_diffuser = 0.5; K_total = K_screen + K_honeycomb + K_corner + K_diffuser; % Dynamic pressure q = 0.5 * 1.225 * V_test^2; delta_p = K_total * q; % Fan power (eta = 0.7) Q = S_ts * V_test; eta = 0.7; P_fan = delta_p * Q / eta; % Display results fprintf('Test Section: %.2f m × %.2f m\n', W_ts, H_ts); fprintf('Reynolds Number: %.2e\n', Re); fprintf('Contraction Ratio: %d\n', CR); fprintf('Fan Power Required: %.2f kW\n', P_fan/1000);

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