13 research outputs found

    Effect of dimples on glancing shock wave turbulent boundary layer interactions

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    An experimental study has been conducted to examine the control effectiveness of dimples on the glancing shock wave turbulent boundary layer interaction produced by a series of hemi-cylindrically blunted fins at Mach numbers 0.8 and 1.4, and at angles of sweep 0°, 15°, 30° and 45°. Schlieren photography, oil flow, pressure sensitive paints, and pressure tappings were employed to examine the characteristics of the induced flow field. The passive control technique used a series of 2 mm diameter, 1 mm deep indents drilled across the hemi-cylindrical leading edge at angles 0°, 45° and 90°. The effects of dimples were highly dependent on their orientation relative to the leading edge apex, and the local boundary layer properties

    Incipient Separation in Shock Wave Boundary Layer Interactions as Induced by Sharp Fin

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    The incipient separation induced by the shock wave turbulent boundary layer interaction at the sharp fin is the subject of present study. Existing theories for the prediction of incipient separation, such as those put forward by McCabe (1966) and Dou and Deng (1992), can have thus far only predicting the direction of surface streamline and tend to over-predict the incipient separation condition based on the Stanbrook's criterion. In this paper, the incipient separation is firstly predicted with Dou and Deng (1992)'s theory and then compared with Lu and Settles (1990)' experimental data. The physical mechanism of the incipient separation as induced by the shock wave/turbulent boundary layer interactions at sharp fin is explained via the surface flow pattern analysis. Furthermore, the reason for the observed discrepancy between the predicted and experimental incipient separation conditions is clarified. It is found that when the wall limiting streamlines behind the shock wave becomes\ aligning with one ray from the virtual origin as the strength of shock wave increases, the incipient separation line is formed at which the wall limiting streamline becomes perpendicular to the local pressure gradient. The formation of this incipient separation line is the beginning of the separation process. The effects of Reynolds number and the Mach number on incipient separation are also discussed. Finally, a correlation for the correction of the incipient separation angle as predicted by the theory is also given.Comment: 34 pages; 9 figure

    Human Resource Flexibility as a Mediating Variable Between High Performance Work Systems and Performance

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    Much of the human resource management literature has demonstrated the impact of high performance work systems (HPWS) on organizational performance. A new generation of studies is emerging in this literature that recommends the inclusion of mediating variables between HPWS and organizational performance. The increasing rate of dynamism in competitive environments suggests that measures of employee adaptability should be included as a mechanism that may explain the relevance of HPWS to firm competitiveness. On a sample of 226 Spanish firms, the study’s results confirm that HPWS influences performance through its impact on the firm’s human resource (HR) flexibility

    Reynolds-Averaged Simulations of Shock-Wave/Boundary-Layer Interactions with Bleed

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    Correlacionando tipos de cultura organizacional com estratégias de remuneração utilizando a tipologia de Charles Handy

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    Este estudo identificou as correlações entre as estratégias de remuneração e a tipologia de cultura organizacional proposta por Handy (2003) baseada nas dimensões do grau de formalização e centralização que identifica a cultura: Zeus (poder), Apolo (papéis), Atena (tarefa), e Dionísio (pessoa). A pesquisa foi aplicada a gestores de remuneração de 76 empresas associadas ao Grupo de Permuta de Informações Salariais (Grupisa), e os questionários com um construto composto por doze componentes da remuneração organizacional foram analisados utilizando Correlação de Pearson e Regressão Múltipla. Concluímos que as variáveis de remuneração se correlacionam de forma diferente com cada um dos tipos de cultura: (i) organizações "Zeus" devem enfatizar os fatores comportamentais em todas as esferas do sistema de remuneração; (ii) para as organizações "Apolo" a ênfase deve ser aplicada nas oportunidades de crescimento e desenvolvimento, (iii) nas organizações "Atena" o foco deve ser nas recompensas financeiras, e, (iv) organizações "Dionísio" devem dar ênfase à qualidade da remuneração
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