For a turbofan engine design you can also vary the fan performance and the bypass ratio. When you have a design that you like, you can switch to the Tunnel Test Mode which simulates the testing of a jet engine on a test stand. You can then vary the test altitude, flight speed and throttle setting.
Several existing engines are also modeled in EngineSim. TunnelSim: KB Using the TunnelSim applet, students learn more about the aerodynamics of wind tunnels by changing the shape and flow conditions through the tunnel. This program can be used for the preliminary design of an open return wind tunnel. Speeds are limited to low subsonic operation and the program warns the student of high speed flow and possible separation in the diffuser. Undergraduate Computer Programs: Here is a group of Java programs which were designed to help undergraduate engineering students learn about the basics of aerodynamics and propulsion.
There are programs to solve for the flows across shock waves and expansion fans, the flow through crossed and reflected shocks, and the properties in regions of isentropic flow. TunnelSys is composed of three programs that simulate the design, wind tunnel testing, and post-processing of wind tunnel data.
There are separate applets for the design and testing portions which illustrate details of the geometry and tunnel test techniques. There is an application version of TunnelSys that allows three students to work as a team designing and testing an aircraft wing in a virtual wind tunnel. With the application, students can save the results of their designs and testing to output files.
RangeGames: KB This program presents a variety of multiple choice math and physics problems involving aircraft performance. The student can choose from several different types of aircraft and must answer questions about the range, fuel usage, acceleration, velocity and location of the aircraft during take-off.
RangeGames can record your answers for teacher evaluation, or you can just play for fun. This allows Sentry-II to zero in on more very low probability impact scenarios, some of which Sentry may have missed. Farnocchia likens the process to searching for needles in a haystack: The needles are possible impact scenarios, and the haystack is the uncertainty region.
Sentry would randomly poke at the haystack thousands of times looking for needles located near a single line stretching through the haystack. The assumption was that following this line was the best way of searching for needles. But Sentry-II assumes no line and instead throws thousands of tiny magnets randomly all over that haystack, which quickly get attracted to, and then find, the nearby needles.
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