Experimental measurements in Hartman oscillators

The paper presents high frequency pointwise measurements of pressure and temperature carried out on a shock wave generator consisting of a couple of supersonic jets impinging on a Hartman oscillator system. The shock wave generator was developed as a means to achieve an aerodynamically controlled pulsed detonation chamber. The analysis allows the selection of the optimal geometry and inlet conditions for such an application. The effect of the inlet conditions and of the geometry of the experimental model on the frequency and amplitude of the pressure waves occurring in the system is analyzed. The paper also presents the effects of other geometrical parameters: the critical section of the jet nozzles, the volume ratio of the resonator geometry, and the inlet angles of the jets. Effects of inlet pressure and temperature are also included

Increasing the Creativity of ENGINO Toy Sets and Generating Automatic Building Instructions

During the First Study Group with Industry which was held in Limassol, Cyprus, the ENGINO⃝R TOY SYSTEM introduced two challenging problems. The first is to get bounds on the number of possible models/toys which can be constructed using a given package of building blocks. And the second is to generate automatically the assembly instructions for a given toy. In this report we summarize our insights and provide preliminary results for the two challenges