FM Radio and the New Hollywood Soundtrack

In studio production between the mid-1960s and early 1980s, the period often referred to as “New Hollywood,” the music soundtrack was the site of significant upheaval. As box office revues continued to plummet, the studios allowed filmmakers greater freedom to experiment with narrative structures and with soundtrack conventions. Specifically, they allowed directors to exert new control over film music, which they did often by jettisoning new composed orchestral scores in favor of compilations of preexisting, recorded music. Film music scholars have long acknowledged this shift, but few have recognized the degree to which the new soundtrack practices that emerged in the New Hollywood period were also the result of radical shifts in popular music and contemporary listening practices. By looking at two films from the early 1970s, Zabriskie Point (1971) and The Strawberry Statement (1970, this article considers the degree to which progressive rock, FM radio, and countercultural listening practices changed not only the content of film soundtracks but also the placement of music in film, unseating long-standing sound hierarchies and privileging music in new ways.

Heat Transfer Implications of Acoustic Resonances in Turbine Internal Cooling Channels

In an attempt to investigate the acoustic resonance effect of serpentine passages on internal convection heat transfer, the present work examines a typical high pressure turbine (HPT) blade internal cooling system, based on the geometry of the NASA E3 engine. In order to identify the associated dominant acoustic characteristics, a numerical finite-element method (FEM) simulation (two-step frequency domain analysis) is conducted to solve the Helmholtz equation with and without source terms. Mode shapes of the relevant identified eigenfrequencies (in the 0–20 kHz range) are studied with respect to induced standing sound wave patterns and the local node/antinode distributions. It is observed that despite the complexity of engine geometries, the predominant resonance behavior can be modeled by a same-ended straight duct. Therefore, capturing the physics observed in a generic geometry, the heat transfer ramifications are experimentally investigated in a scaled wind tunnel facility at a representative resonance condition. Focusing on the straight cooling channel's longitudinal eigenmode in the presence of an isolated rib element, the impact of standing sound waves on convective heat transfer and aerodynamic losses are demonstrated by liquid crystal thermometry, local static pressure and sound level measurements. The findings indicate a pronounced heat transfer influence in the rib wake separation region, without a higher pressure drop penalty. This highlights the potential of modulating the aerothermal performance of the system via acoustic resonance mode excitations.

Heat Transfer Implications of Acoustic Resonances in HP Turbine Blade Internal Cooling Channels

In an attempt to investigate the acoustic resonance effect of serpentine passages on internal convection heat transfer, the present work examines a typical high pressure turbine blade internal cooling system, based on the geometry of the NASA E3 engine. In order to identify the associated dominant acoustic characteristics, a numerical FEM simulation (two-step frequency domain analysis) is conducted to solve the Helmholtz equation with and without source terms. Mode shapes of the relevant identified eigenfrequencies (in the 0–20kHz range) are studied with respect to induced standing sound wave patterns and the local node/antinode distributions. It is observed that despite the complexity of engine geometries, as a first order approximation, the predominant resonance behavior can be modeled by a same-ended straight duct. Therefore, capturing the physics observed in a generic geometry, the heat transfer ramifications are experimentally investigated in a scaled wind tunnel facility at a representative resonance condition. Focusing on the straight cooling channel’s longitudinal eigenmode in the presence of an isolated rib element, the impact of standing sound waves on convective heat transfer and aerodynamic losses are demonstrated by liquid crystal thermometry, local static pressure and sound level measurements. The findings indicate a pronounced heat transfer influence in the rib wake separation region, without a higher pressure drop penalty. This highlights the potential of modulating the aero-thermal performance of the system via acoustic resonance mode excitations.