With the DJS-131-1 minicomputer as the central processing unit,the data system is for a long time used for wind tunnel testing and the result of its operation shows that its performances haye reached the norms expected.

The article introduces the definition and content of MOBILE6.2 model,analyzes its sensitivity,and sets simplified model of vehicle discharging factor combined with the existing condition of vehicle pollution control in our northern cities,and proves that the result of this model is similar to that of highway tunnel testing method.

It is indicated that the simultaneous simulations in lateral jet wind tunnel testing can be realized, in principle, as long as the corresponding compatibility conditions are satisfied.

Due to observations made during standard wind tunnel testing, the structural response of a typical membrane MAV wing in steady level pre-stall flight is thought to be quasi-static.

Corner wall and tunnel testing of foamed thermosetting plastics has suggested that the E-84 anomaly can be resolved by the use of a rate index in the range of 0 to 77.5, where a distance criterion currently prevails.

Wind-tunnel testing, along with visualisation of the dynamics of the boundary layer and the trailing vortex of a ball in flight, demonstrated that both non-spinning and spinning (curved) balls had lowCd values in the super-critical region.

Sectional versus full model wind tunnel testing of bridge road decks

Aeroelastic wind tunnel testing of the laminate was performed and the result showed that flutter, a dynamic instability occurred.

The pressure distribution of noncavitating potcnial flow around gate piers shown in Fig. la has been analysed. The analysis has its practical significance in that the minimum-pressure coefficient is closely related to the incipient cavitation number. After the W plane was mapped on to, the t plane with known transformations except an unknown parameter m, the complex velocity was expressed by Eq. (10) in terms of an unknown function Ω (t). Eqs. (13) and (16) indicate that along the boundary f and g are respectively...

The pressure distribution of noncavitating potcnial flow around gate piers shown in Fig. la has been analysed. The analysis has its practical significance in that the minimum-pressure coefficient is closely related to the incipient cavitation number. After the W plane was mapped on to, the t plane with known transformations except an unknown parameter m, the complex velocity was expressed by Eq. (10) in terms of an unknown function Ω (t). Eqs. (13) and (16) indicate that along the boundary f and g are respectively related, to the magnitude of the boundary velocity and the boundary geometry. Three equations to solve for the three unknowns are furnished by the conditions along the boundary: (1) The angle τ is given as a function of z. (2) f and g, being the real and imaginary parts of an analytic function, are related to each other. (3) The points of tangency are transformed to points on the real axis of the t plane. For the case in which the nose curve is composed of circular arcs, Eqs. (22), (28) and (29) were derived. The functions f and g were found numerically by iteration, and m was computed from Eq. (28). The distribution of velocity and that of pressure along the line of symmetry and the boundary were computed and plotted in Fig. 5, in which the pressure distribution from wind tunnel tests was also included. Preliminary results on incipient cavitation number were plotted in Fig. 6, to be compared with the theoretical |C_(pm)| curve. More tests are being done to study the scale effects.

The present investigation is concerned with the determination of pressure distribution along curved boundaries formed by circular arcs often found in hydraulic structures. The boundary geometry considered are: (1) Semi-infinite pier in closed conduit with head part formed by two circular arcs, (2) Isolated circular-arc irregularity on the wall of closed conduit. Analytical results. found by means of conformal transformation were compared with experimental data from wind tunnel and water tunnel tests,...

The present investigation is concerned with the determination of pressure distribution along curved boundaries formed by circular arcs often found in hydraulic structures. The boundary geometry considered are: (1) Semi-infinite pier in closed conduit with head part formed by two circular arcs, (2) Isolated circular-arc irregularity on the wall of closed conduit. Analytical results. found by means of conformal transformation were compared with experimental data from wind tunnel and water tunnel tests, and with those obtained in previous investigations. Data on incipient cavitation number found from water tunnel tests and from published papers were compared with some of the calculated—C_(pmin). Agreement is good.

This article describes dynamic stress measurement of x-type of helicopter tail rotor tunnel test in several principal aspects. According to the test requirements emphases are laid on reasonably selecting specimen, measured poi its and method of instrumentation from the view point of dynamic response. A noticeable problem, the influence of support conditions in dynamic stress measureme it of tunnel test is presented.