Abstract
The fact of injecting bubbles into a cavitating flow influences typical cavitating behavior. Cavitation and aerated cavitation experiments has been carried out on a symmetrical venturi nozzle with convergent/divergent angles of 18° and 8°, respectively. A snapshot Proper Orthogonal Decomposition (POD) technique is used to identify different modes in terms of discharge flow velocity, pressure and injected quantity of air. The energy spectrum per given mode is also presented. The first four modes are outlined in the present paper for an aerated and non-aerated cavitating flows.
Highlights
Aerated cavitating flow contains numerous coexisting flow regimes
All of the images are normalized using a reference image taken at non-cavitating non-aerated flow conditions
The Proper Orthogonal Decomposition (POD) analyses in this work follows the one described in [4]
Summary
Aerated cavitating flow contains numerous coexisting flow regimes. By nature, the cavitation has an aggressive behaviour and it is capable of doing severe damage to adjacent structures. Controlling cavitation behaviour can help produce a stable regime as opposed to an unstable one. For this purpose, passive control methods based on surface roughness have been studied [1]. Passive control methods based on surface roughness have been studied [1] Another recently used technique influencing the cavitation inception is the aeration of the flow [2]. In order to reveal and explore those aerated cavitating regimes, a snapshot Proper Orthogonal Decomposition (POD) analyses have been conducted [3,4]. The transparent symmetrical venturi nozzle is placed in the test section (see figure 1), between the two tanks. The vapor pressure in operating conditions is considered 2200 Pa at 19◦C
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