Showing papers by "Cranfield University published in 1967"
TL;DR: Air entrainment is often entrained naturally by flowing water and appears generally to be beneficial as discussed by the authors, and very few hazards tend to arise with these naturally occurring flows, and the quality of the water, certainly, is improved by air entraining.
Abstract: AIR is often entrained naturally by flowing water—for example, in the plunging waters of mountain streams, waterfalls, bores, breakers, hydraulic jumps and subterranean siphons—and, in these and similar situations, appears generally to be beneficial. The quality of the water, certainly, is improved by air entrainment and very few hazards tend to arise with these naturally occurring flows.
10 citations
01 Sep 1967
TL;DR: In this paper, the authors describe some apparatus which have been developed to measure those characteristics which are of interest in vehicle ride and handling, such as:Vertical, lateral and fore-and-aft tyre stiffnesses and damper characteristics.
Abstract: The paper describes some apparatus which has been developed to measure those characteristics which are of interest in vehicle ride and handling. These are:Vertical, lateral and fore-and-aft tyre stiffnesses and damper characteristics. Suspension spring rates and friction, suspension geometry and suspension roll stiffnesses. Steering gear geometry and dynamic characteristics, moments and products of inertia of the vehicle and vibration characteristics of the seats.Some relevant theory and sample results are included in the Appendices.
5 citations
01 Sep 1967
TL;DR: In this article, an attempt has been made to account for the scale effects observed when comparing the suction performance of a pump with that predicted from model tests by considering the thermodynamic aspects of cavitation.
Abstract: An attempt has been made to account for the scale effects observed when comparing the suction performance of a pump with that predicted from model tests by considering the thermodynamic aspects of cavitation. However, although improvements in the prediction of performance may be obtained in some cases by using the equation developed, these aspects do not account for all the scale effects observed.
1 citations
01 Sep 1967
TL;DR: In this article, a general discussion is given of modeling techniques based on dimensional analysis and similarity for two-phase effects, where it is neither always obvious which are the predominant forces nor whether considering only two forces will give reasonable similarity.
Abstract: A general discussion is given of modelling techniques based on dimensional analysis and similarity. Particular attention is focused on the modelling of two-phase effects, where it is neither always obvious which are the predominant forces nor whether considering only two forces will give reasonable similarity. Three examples—air-entraining flows, high, siphons, and bubbly flows—are considered and some suggestions of suitable model scaling laws are made. These include We/Re for air entrainment and the cavitation number for high siphons. The results of model tests on air-entraining vortices at the Kariba Hydroelectric Scheme are presented as an application of the discussion.
1 citations
01 Sep 1967
TL;DR: In this paper, the effect of individual components on scaling laws is considered and it is shown that it is unlikely that any single scaling law can be applied to pumps as well as turbines, to pumps of different specific speeds, or to pumps with the same specific speed but designed to differing philosophies.
Abstract: Although many scaling laws are available for the assessment of prototype performance from tests on small-scale models, the discrepancies between them are wide and varied.This paper considers the effect of individual components and shows that it is unlikely that any single law can be applied to pumps as well as turbines, to pumps of different specific speeds, or to pumps of the same specific speed but designed to differing philosophies.It is proposed that more information pertaining to scaling laws can be acquired if pumps running at different speeds and in different fluids are studied.