Closed-circuit wind tunnels can produce higher speeds than open-circuit tunnels with the same power input because energy is recovered in the diffuser downstream from the test section. The kinetic energy ratio is a figure of merit defined as the ratio of the kinetic energy flux in the test section to the drive power. Estimate the kinetic energy ratio for the \(40 \mathrm{ft} \times 80 \mathrm{ft}\) wind tunnel at NASAAmes .