Contribution to the theory of rotary jet flow induction.

Hohenemser, Kurt; Porter, J. L.

doi:10.2514/3.43744

Cited by 7 publications

(1 citation statement)

References 2 publications

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“…In these applications, a large amount of flow induction with a small degree of compression is sought. After the beneficial pressure exchange effect of the rotary jet ejector for thrust augmenting applications was confirmed by numerous experimental investigations by Foa and Garris [7], Sladky [8], Hohenemser and Porter [9], and others, a truly exciting new pressure-exchange concept emerged for ejector refrigeration systems: the supersonic rotor-vane pressure-exchange. A sectional view of the supersonic rotor-vane pressure-exchange ejector and a blow up of the vaned rotor are shown in Fig.…”

Section: Supersonic/rotor-vane/pressure-exchange Ejectormentioning

confidence: 97%

A novel thermally driven rotor-vane/pressure-exchange ejector refrigeration system with environmental benefits and energy efficiency

Hong

Alhussan

Zhang

et al. 2004

Energy

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Section: Supersonic/rotor-vane/pressure-exchange Ejectormentioning

confidence: 97%

A novel thermally driven rotor-vane/pressure-exchange ejector refrigeration system with environmental benefits and energy efficiency

Hong

Alhussan

Zhang

et al. 2004

Energy

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The effects of the secondary fluid temperature on the energy transfer in an unsteady ejector with a radial-flow diffuser

et al. 2009

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Positional faithfulness, positional neutralisation and Shona vowel harmony

1997

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The distribution of the feature [high] in Shona verbs is a prototypical example of positional neutralisation accompanied by vowel harmony."2 In languages which exhibit positional neutralisation of vowel contrasts, one or more vowels (generally, the most marked members of the vowel inventory) may occur distinctively in only a small subset of the structural positions available in the language. Outside of these positions, the marked vowels may surface only if they harmonise with a similar vowel in the privileged position. For example, the mid vowels e and o in Shona verbs are contrastive only in root-initial syllables. These vowels may appear in subsequent syllables only when preceded by a mid vowel in root-initial position. A string of height-harmonic Shona vowels is therefore firmly anchored in the root-initial syllable, as shown in (1): (1) Height-harmonic Shona verbs (Fortune 1955) pera ' end' per-era 'end in' sona 'sew) son-era 'sew for' vererjga 'count' vererjg-eka 'be numerable' tonda 'face' tond-esa 'make to face' oma 'be dry' om-esa 'cause to get dry' seka 'laugh' sek-erera 'laugh on and on' ipa 'be evil' ip-ira 'be evil for' bvisa 'remove' bvis-ika 'be easily removed' bvuma 'agree' bvum-isa 'make agree' pinda 'pass' pind-irira 'to pass right through' Low vowels neither trigger nor propagate height harmony; only [+high] i and u may follow a low vowel, even if the root-initial vowel is mid. This is true of both roots and derived combinations: 1 2 Yill N. Beckman (2) Low vowels block harmony charuk-'jump over/across' ganhur-'limit, demarcate' katuk-'flicker (flame)' tandanis-'chase' kwazis-' greet' pofomadza 'blind' pofomadz-ira 'blind for' tarisa 'look at' taris-ika 'easy to look at' shamba ' wash' shamb-isa 'make wash' pamha 'do again' pamh-isa 'make do again' cheyama 'be twisted' cheyam-isa 'make be twisted' A final restriction on Shona height harmony arises in the interaction of rounding and height harmony. Harmony fails to apply between a rootinitial mid front e and a subsequent round vowel. Thus, rather than a height-harmonic string of e ... o, we find disharmonic e ... u. Harmony applies regularly when the initial vowel is round o: (3) Height and roundness interactions serenuk-'water (gums of *serenokmouth)' svetuk-'jump' svetuk-ira 'jump in' *svetok-era pet-'fold' pet-enura 'unfold' *pet-enora pofomadz-'blind (TRANS)' *pofumadzgobor-' uproot' *goburtonhor-'be cold' *tonhurnonok-'dally, delay' *nonukbover-' collapse inwards' *bovir kobodek-'become empty' *kobudik-In this paper, I present a full analysis of Shona height harmony, encompassing the positional neutralisation of height (1), the inertia of low vowels in the system (2), and the rounding restriction on the spreading of [-high] (3). All of these facts arise from the interaction of markedness and faithfulness constraints in Optimality Theory (OT; Prince & Smolensky 1993). The principle innovation here is a set of ROOT-INITIAL FAITHFULNESS CONSTRAINTS, one instantiation of a family of POSITIONAL FAITHFULNESS CONSTRAINTS. Positional faithfulness co...

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Contribution to the theory of rotary jet flow induction.

Cited by 7 publications

References 2 publications

A novel thermally driven rotor-vane/pressure-exchange ejector refrigeration system with environmental benefits and energy efficiency

A novel thermally driven rotor-vane/pressure-exchange ejector refrigeration system with environmental benefits and energy efficiency

The effects of the secondary fluid temperature on the energy transfer in an unsteady ejector with a radial-flow diffuser

Positional faithfulness, positional neutralisation and Shona vowel harmony

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